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The MS Jet Database engine is the database engine on which numerous Microsoft products are built. It is the underlying component of the Microsoft Exchange Server database and a collection of information stored on the computer in systematic way.


It is the most important component of the Exchange Server database which manages the database objects effectively and accelerates the database performance. It is the critical object for large databases for providing easy and quick access to the user.


But sometimes, this critical component of the database becomes problematic and causes several difficulties. You can face the following error messages when such situations occur:

  • JET_errRecordNotFound, the key was not found
  • JET_errReadVerifyFailure Read verification error 4294966278
  • The Microsoft Jet database engine cannot open the file '(unknown)'. It is already opened exclusively by another user, or you need permission to view its data.
  • 100 JET_errRfsFailure
  • Unable to initialize DAO/Jet db engine
  • The Jet VBA file (VBAJET.dll for 16-bit versions, or VBAJET32.dll for 32-bit versions) failed to initialize when called. Try reinstalling the applications that returned the error
  • The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time

"After any of these error messages, the database becomes inaccessible that can ultimately lead to the nightmare of data loss. For repairing the database and accessing the data, it is required to identify the cause of the error message. There can be several reasons of these error messages such as:"

  • The Microsoft Jet or DAO files are mismatched, or one or more of the DAO or Jet files are damaged
  • Data was written incorrectly in the database file, which could be caused by third party applications that integrates with Exchange Server
  • There are corrupted objects in the database
  • Whole of your EDB file is damaged
  • Exchange Server Jet Engine has got damaged

If any of the above situations occurs, you can't access the database and can fall in need of Exchange Server recovery. Exchange Server recovery can be carried out by methodically scanning the damaged EDB file and the same job is done by Exchange recovery software.


A great care should be taken while selecting an EDB recovery software because an inefficient software can make the conditions worsen and can lead to further damage. It can possibly make the data permanently inaccessible.


Stellar Phoenix Mailbox Exchange Recovery software is the right choice for all of the EDB recovery needs. A complete and systematic scan is done by this software to absolutely recover the damaged EDB file. Interactive and intuitive user interface of the software let the less technically skilled users to have easy and quick EDB recovery.


Due to the read only and non destructive demeanor of this software, safe and original Exchange recovery is achieved. After recovery, this software converts the EDB file into PST format that can be directly used with Microsoft Outlook email client. Exchange Recovery can be executed using the software from all file versions of Exchange Server including 5.5, 2000, 2003, 2007 and 2010.  


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