exchange recovery

Like other databases, Microsoft Exchange Server database (EDB file) may also corrupt at some point of time and does not let you perform typical Exchange Server operations. The corruption can be of two types – Logical and Physical. Logical corruption is pretty common and occurs due to internal fault in the database. When it happens, Microsoft Exchange Server database becomes totally unusable and you encounter serious data loss. MS Exchange Server does not include any utility to detect and fix logical corruption. Thus, you are required to opt for Exchange Recovery to get your valuable data back.

You may encounter logical corruption of EDB file due to any of the following reasons:

1.If you incorrectly run the soft recovery using eseutil /r tool after restoring database from an online backup, it replays only log files and ignores the patch files. It may result in logical corruption. Extensible Storage Engine 98 does not let you run the soft recovery on an EDB file that needs hard recovery. In case you try this, the following Jet error appears in Application Event Log of Exchange Server:

“JET_errSoftRecoveryOnBackupDatabase (-544)”

2.If you initialize an inconsistent EDB file, the process checks whether that log range specified in database header is there in directory of log, and signatures of both log and database are correct. In case it does not find the specified values, it logs the below event:

“JET_errRequiredLogFilesMissing (-543)”

3.The database may also face logical corruption if you run eseutil /p utility. Jet-level Exchange Server database repairs result in some inefficient disk space uses and data loss, because it fixes the EDB file by deleting the corrupt data.

Resolution

To fix this problem and ensure effective Microsoft Exchange recovery, follow the underwritten steps:

1. Defragment the database using eseutil /d command and then run database integrity check using Isinteg -fix command.
2. Restore corrupt EDB file from the most recent backup. You should not run the soft recovery after restoring from backup as it may cause further damage.
3. Use third party Exchange recovery software to repair and restore the problem database.

The Exchange recovery tool is particularly designed to perform in-depth scan of entire EDB file and extract all inaccessible data from it. They offer simple and secure Exchange Server Recovery due to their rich graphical user interface and non-destructive nature.

Stellar Phoenix Exchange Mailbox Recovery is the most efficient and comprehensive exchange server recovery tool to offer exchange database recovery in all EDB corruption scenarios. It restores emails, contacts, tasks, notes, journal, attachments, appointments, and other EDB file objects. The exchange user profile recovery software works well with MS Exchange Server 2007, 2003, 2000, and 5.5.

In a practical scenario, the Information Store Service of Exchange Server may fail to start and you encounter the below errors in Application Event Log of Exchange Server, while read/writing data from/to EDB file:

“Event Type: Error
Event Source: ESE
Event Category: General
Event ID: 482
User: N/A
Description:
Information Store (4360) First Storage Group: An attempt to write to the file “D:\Program Files\Exchsrvr\mdbdata\res2.log” at offset 4194304 (0×0000000000400000) for 1048576 (0×00100000) bytes failed after 0 seconds with system error 112 (0×00000070): “There is not enough space on the disk.”. The write operation will fail with error -1808 (0xfffff8f0). If this error persists then the file may be damaged and may need to be restored from a previous backup.”

You can not access the database after above error. To gain access of your valuable data in the EDB file, you need to identify the root of this issue and perform Microsoft Exchange recovery by resolving it.

Root of the problem:

You may face this behavior of Exchange Server due to any of the below reasons:

1. You do not have sufficient free space on the Exchange Server hard drive. The Error 0×00000070 entails ERROR_DISK_FULL and Error 0xfffff8f0 entails JET_errDiskFull.
2. EDB file is corrupt and Exchange Server can not recognize it.

Resolution:

You can try out any of the below methods to sort out this problem:
1.If problem is caused by low disk space, remove some files to free up disk space.
2.If database corruption is causing the issue, repair and restore the database using powerful and advanced commercial Exchange recovery software.

The Exchange recovery tool carry out in-depth scan of entire Exchange Server database and extract all inaccessible data from it. You need not to be technically sound to use these tools and repair the database as they have interactive graphical user interface.

Stellar Phoenix Exchange Mailbox Recovery is the most powerful, yet easy to use exchange database recovery application to ensure easy recovery in all EDB corruption scenarios. The Exchange 2007 recovery software works well with Microsoft Exchange Server 2007, 2003, 2000, and 5.5. It restores inaccessible objects of EDB file, such as emails, notes, tasks, contacts, journal, calendar items, and more.

In a practical scenario, you cannot start the Exchange Server services after installing Microsoft Exchange Server 2007 on the global catalog server. But, other services can be started manually. Furthermore, you may see the below events in the Event Log of Exchange Server:

• Event ID: 2601
  Source: MSExchange ADAccess
  Category: General
  Type: Warning
  Description: Process MSEXCHANGEADTOPOLOGY (PID=1624). When initializing a remote procedure call (RPC) to the Microsoft Exchange Active Directory Topology service, Exchange could not retrieve the SID for account <WKGUID=DC1301662F547445B9C490A52961F8FC,CN=Microsoft Exchange,CN=Services,CN=Configuration,…> – Error code=80040934. The Microsoft Exchange Active Directory Topology service will continue starting with limited permissions.
• Event ID: 5000
  Source: MSExchangeIS
  Category: General
  Type: Error
  Description: Unable to initialize the Microsoft Exchange Information Store service. – Error 0×96e.

Exchange Server is partially dependent upon Microsoft Exchange System Attendant. Exchange Server Information Store service is not dependent upon Microsoft Exchange System Attendant.

Cause

The problem may occur, if:

• Exchange Server domain controller and other services don’t start completely.
• Exchange Server database is corrupted.

Resolution

To perform Microsoft Exchange Recovery, follow the given steps:

• Manually start Exchange services.
• Change Exchange Server dependencies.
• Use Exchange Recovery Software to repair and restore damaged EDB file of Microsoft Exchange Server.

The Exchange Recovery tool are capable of methodically scanning the damaged Exchange Server database and extract all inaccessible data from it. The software are totally safe and easy to use with read-only nature and interactive user interface.

Stellar Phoenix Mailbox Exchange Recovery software repairs and restores damaged Exchange Server database in all cases of corruption. The software works well with Microsoft Exchange Server 2007, 2003, 2000, and 5.5. It restores all EDB file objects, such as emails, notes, contacts, tasks, attachments, appointments, and more.

To recover Microsoft Windows Store that doesn’t start, use the below methods:

• Check Application Event Log of Windows NT Event Viewer for MSExchangePub, MSExchangePriv, EDB, and MSExchangeIS messages. The messages may provide you information about actual cause of the problem.
• Shut down all the MS exchange Server services, and then restart Exchange Server. When information store service restarts, it attempts to recover automatically and return database to consistent state.
• Create an absolute backup of Microsoft Exchange Server Information Store. It must include all the EDB and Log files.
• Restore database from last complete online backup. Make sure that you don’t click to choose ‘Start Service after Restore’ option. Restore incremental backups of Information Store. Only click selecting ‘Start Service after Restore’ option while restoring current incremental backup. Do not select ‘Erase all existing data’ option.
• If the above method can not help you start information store, check Event Log and review logged messages for EDB.
• If the above method doesn’t work, restore online backup of information store. Select ‘Start Service after Restore’ and ‘Erase all existing data’ options.
• Remove all the Log and EDB files from Mdbdata folder and then restore copies of Pub.edb and Priv.edb databases from backup.
• If none of the above methods work, you need to wipe the information store as last resort.
• If wiping does not work, you need to remove the Information store. However, it causes data loss. The easiest and safest way to retrieve data in such situations is Microsoft Exchange Recovery.

Recovery is possible using powerful and advanced third-party applications, known as Exchange Recovery Software. The applications are able to handle all EDB corruption situations, irrespective of the cause of corruption.

The Exchange Recovery Tool employ efficient database scanning techniques to methodically scan whole EDB file and extract damaged objects from it. With simple graphical user interface and read-only conduct, the applications are easy and totally safe to use.

Exchange Recovery software is the most advanced utility to recover your Exchange Server database from corruption. It works well with Microsoft Exchange Server 2007, 2003, 2000, and 5.5. The software restores all EDB file objects such as emails, notes, contacts, tasks, appointments, attachments, and more.

For better understanding of the subject, consider, you as an Exchange Server administrator, are not aware of the fact that resetting the log sequence is necessary, and, you suddenly observe that the Information Store has stopped functioning or is not working correctly for no apparent reason. Additionally, when you view the application log, you receive the below mentioned log:

Event ID: 125
Event Source: ESE97
Event Type: Error
Description:
MSExchangeIS () Unable to create the log. The drive may be read-only, out of disk space, misconfigured, or corrupted. Error -519.

Further, when you try to start the Information Store, the following event entry is received in the application log:

Event ID: 7024
Event Source: Service Control Manager
Event Type: Error
Description:
The Microsoft Exchange Information Store service terminated with service-specific error 4294966786.

Thus Information Store is not accessible by any means.

Cause

As mentioned earlier, the above behavior can result if the log file name sequence of Information Store transaction logs has reached the maximum value of Edbfffff.log.

Solution

You can implement any of the applicable methods to isolate the given issue:

1. Check for an offline backup. If present, use it to restore affected Information Store databases
2. If no suitable backup is available, perform hard repair on databases. For this, you need to run eseutil /p, eseutil /d, and isinteg utilities. But keep in mind to backup your database first, as hard repair can delete important pages from your databases.
3. Use a third-party Exchange Recovery Software to repair and restore corrupted Information Store databases. These Exchange Server Recovery software are more effective and safe than Exchange Server repair utilities.

Exchange Recovery Tool is a reliable utility that repairs corrupted Exchange Server databases and restores their mailboxes as PST files to a secure location, which is specified by the user. This Exchange Recovery software supports MS Exchange Server 2007, 2003, 2000, and 5.5.

In a practical scenario, you may come across the below symptoms when the Exchange Server Information Store gets damaged:

1. Currently logged on Exchange Server users identify that their systems stop responding.
2. The utilization percentage of the Information Store becomes very high (for instance, 70%).
3. When you apply the ISINTEG (Information Store Integrity Checker) tool on damaged Information Store, the process stops responding halfway. The tool fails to check the integrity of Exchange Server.
4. When you apply the EDBUTIL utility, which repairs the Exchange Server database, this process also stops responding midway and may show which database table is causing the problem.

In this scenario, entire EDB database become inaccessible. In order to gain access of the database, you need to find out the actual cause of this behavior and perform Microsoft Exchange Recovery by sorting it out.

Grounds of the problem:

You may face this issue if internal pages of Exchange Server database table are damaged. The corruption can be caused by various reasons, like application malfunction and virus infection.

Resolution:

To sort out this problem, you need to restore the database from current backup. Go through the below steps to restore EDB database:

1. Click Start button, and go to Programs-> Accessories-> System Tools-> Backup.
2. Click Restore tab.
3. Select the objects from the file that you need to restore.
4. In Restore files to dialog box, select option that you wish.
5. Click Start Restore button.

If the backup is not available, you are required to go for third-party Exchange Mailbox Recovery software to extract inaccessible data from the database. They enable you to methodically scan entire database and recover all data from the database. The Exchange Recovery Tools do not demand sound and prior technical skills as they have interactive graphical user interface.

Exchange Mailbox Recovery is the most advanced exchange database recovery utility that successfully handles all types of Exchange Server database scenarios. The Exchange Recovery software is designed for Microsoft Exchange Server 2007, 2003, 2000, and 5.5. It recovers all EDB file objects, such as emails, contacts, notes, attachments, appointments, journal, and calendar items.

Corruption of IIS metabase and Exchange Server database is a very serious concern. It can cause several Exchange Server vulnerabilities and make Exchange-related services unusable. In case of metabase corruption, you may encounter the below error message:

“[15:52:34] – The Internet Information Server metabase appears to be corrupt. Please uninstall and reinstall Internet Information Server. — ID:62145 –
[15:52:34] Prerequisites for Microsoft Exchange Messaging and Collaboration Services failed: The component ‘Microsoft Exchange Messaging and Collaboration Services’ cannot be assigned the action ‘Upgrade’ because:- The Internet Information Server metabase appears to be corrupt. Please uninstall and reinstall Internet Information Server.”

The above error, in particular, occurs due to missing metabase entries. If various users perform transactions after metabase corruption, the EDB file may encounter several inconsistency issues. In such situations, to bring your Exchange Server in working state, you need to fix this behavior using Microsoft Exchange Recovery Tool.

Resolution

You can use Adsutil.vbs, an inbuilt utility of Microsoft Exchange Server, to locate metabase objects. However, if you encounter the following error while using Adsutil.vbs tool, you have to reinstall Internet Information Service and Microsoft Exchange Server:

“-2147221020 (0×800401e4)
Error trying to enum the object (GetObject failed)”

Although, reinstalling the Exchange Server and IIS may fix this problem, but it can not repair the corrupted Exchange Server database. In order to repair and restore the damaged EDB file, you need to use third-party Exchange Recovery Software.

The applications are particularly designed to carry out systematic scan of entire EDB file (using advanced scanning mechanisms) and to extract all damaged and inaccessible objects. They enable you to perform Exchange Recovery on your own, as they have simple and self-descriptive graphical user interface.

Exchange Mailbox Recovery software repairs damaged EDB file and restores all user mailboxes as individual PST files. The Exchange Database Recovery software works well with Microsoft Exchange Server 2007, 2003, 2000, and 5.5. It restores all EDB file objects, such as emails, notes, contacts, tasks, journals, appointments, and attachments.

Let’s elucidate the related problems by taking a suitable example of following event ID.

Event Type: Error
Event Source: ESE
Event Category: Database Page Cache
Event ID: 476
Date: date
Time: time
User: user_name
Computer: computer_name
Description:

Affected_Component The database page read from the file “file_name” at offset offset for number_bytes bytes failed verification because it contains no page data. The read operation will fail with error error_number. If this condition persists then please restore the database from a previous backup. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.

Event 476 is linked with a -1019 error in the event log.

Cause

Database read operation has failed. Particularly, this indicates that the specified database page that has been mentioned in database file, for example pub1.edb, is empty and has no data when it is being anticipated to be in use.

Error -1019 corresponds to ‘JET_errPageNotInitialized’ or an empty database page. This can occur due to invalid links between database pages, file system inconsistencies, or pages that have been mapped but are not associated with the database file.

Though ordinary hardware diagnostics might fail to detect the problems, but most of these issues happen because of device drivers, firmware, and hardware related concerns.

Solution

Get the new hardware and use one of the below methods:

• Use Move Mailbox tool by installing another server and move all the mailboxes
• Run Exmerge utility to obtain all mailboxes as *.pst files
• Restore the database from backup
• Repair the database using Eseutil/p and Isinteg -fix commands
• Use a third-party Microsoft Exchange Recovery tool

Note: A third-party Exchange Server Recovery application is more safer than Exchange hard repair utility- Eseutil/p. The latter utility can delete the database pages and cause serious data loss.

Exchange Mailbox Recovery is a professional tool designed to repair corrupted Exchange Server 2007, 2003, 2000 and 5.5 database and extracts the mailboxes in individual *.pst files. This Exchange Recovery software can also recover deleted mailboxes and can restore all e-mails, notes, contacts, calendars, tasks, appointments, etc.

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In a practical scenario, you may see the below even log entries in the Application Event Log of Exchange Server:

“Date: date Source: ESE
Time: time Category: Database Corruption
Type: Error Event ID: 447
User: N/A
Computer: Server name
Description: Information Store (nnnn) A bad page link (error -338) has been detected in a
B-Tree (ObjectId: 70950, PgnoRoot: 157120) of database e:\Program
Files\exchsrvr\mdbdata\priv1.edb (157120 => 296404, 296403).”

The above problem may render your database completely inaccessible. You cannot access your precious emails, notes, contacts, tasks, journal, calendar entries, and other mailbox items. In order to gain access of your data, it is essential to identify the actual cause of this issue and perform Microsoft Exchange Recovery by sorting it out.

Grounds of the issue:

This behavior may occur due to the following possible causes:

• The transactions are not committed to the hard drive by Disk Caching and the Exchange Server is crashed or stopped responding.
• Wrong log files are replayed while restoring the database.
• Exchange Server hard drive is having logical problems, like operating system malfunction, virus infection, file system corruption, and more.
• The database is corrupted due to improper system shutdown, virus infection, application crash, and other such reasons.

Resolution

In order to work around this issue, go through the below steps:

• If your hard drive has logical problems, run ChkDsk utility to detect and fix hard drive related errors.
• In case of database corruption and other database related issues, run DBCC CHECKDB.

However, if the database corruption cannot be fixed by DBCC CHECKDB due to high extent of damage, you need to use third-party Exchange Recovery Software. They work in most of the database corruption situations.

The Exchange Recovery Tools methodically scan entire database and restore all of its inaccessible and damaged components. With read-only conduct and simple graphical user interface, they are totally safe and easy to use.

Exchange Recovery is the most advanced utility for assured recovery of damaged EDB file. The software is able to restore all EDB file objects including emails, notes, contacts, tasks, schedules, attachments, and more. It is designed for Microsoft Exchange Server 2007, 2003, 2000, and 5.5.

To depict the probable events, let’s take a related scenario of an Exchange Server 2003 user. When he runs a backup utility to copy the Exchange database, the operation halts with an error that reads:

“Database was not found and could not be backed up. Please make sure database exists and is mounted.”

The logs also consist of errors such as:

“Store_Name is a corrupt file. This file cannot verify.”

Or

“Access is denied. Access denied to database Mailbox Store.”

On exploring the application event log, it shows error -1018.

Cause

The root cause of the above behavior is corruption of Exchange mailbox store, most likely due to hardware issues. These errors cause checksum errors in database pages.

Solution

To resolve the problem:

1. You need to run system hardware diagnostics to find the root cause and then isolate the related issues.
2. User can create a new mailbox store and move the mailboxes from the corrupted store, to correct the database problems.
3. You can also try repairing the corrupted database using Eseutil/p repair utility. However, this command is often unrecommended because it deletes the corrupted database pages and can cause important data to delete.
4. And, for safe database repair, use an Exchange Recovery Tool. Designed to run safe scanning procedures, these Microsoft Exchange Server Recovery software can repair corrupted database and extract valuable data.

Exchange Recovery Software is a professional exchange repair tool built for fixing corruption with Exchange databases created with MS Exchange Server 2007, 2003, 2000, and 5.5. The software recovers deleted mailboxes and includes various advanced options. Compatible with Windows 7, Vista, XP, 2003, and 2000, this Exchange Server Recovery Tool extracts mailboxes in separate *.pst files.

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Such problems will be more clear with the further scenario. An Exchange administrator runs a backup process for its Exchange Server Information Store database. It observes that the backup could not be completed. Further, when it views the application log, it encounters the below error written in the description section of event logged:

“Information Store (3732) 23aca049-4dfa-4e45-b2f8-64c5414a947a: The backup has been stopped because it was halted by the client or the connection with the client failed.”

The associated event ID can be 215 or 447.

Cause

Some possible reasons for the above error to occur are:

• You have installed a third-party event sink that is incompatible or being problematic
• You are using a backup application that is incompatible or being problematic
• The hard disk or hard disk controller is faulty
• You are trying to backup a corrupted Exchange database

Solution

The suggested measures to solve the above problem are:

• Uninstall the third-party event sink.
• Try to use a different backup application, preferably suggested by Microsoft like, NTBackup or try to reinstall the existing backup program.
• Check the system log for probable hard disk and hard disk controller issues. Based on the issue, perform operations like repairing hard disk by running chkdsk and installing the recent driver and firmware updates.
• Repair the corrupted database using ‘Eseutil’ hard repair commands on a backup of database. If the resultant database has some important data missing, use a third-party, safe Exchange Recovery utility. A Microsoft Exchange Recovery software can scan and repair corrupted Exchange database using effective scanning algorithms.

Exchange Mailbox Recovery is a professional utility that repairs corrupted Exchange database and extracts the mailboxes as separate *.pst files. Incorporated with deleted mailbox recovery feature, this Microsoft Exchange Recovery utility supports MS Exchange Server 2007, 2003, 2000, and 5.5.