“Access denied to database Mailbox Store (SERVER2K3).
WARNING: “\\SERVER2K3\Microsoft Information Store\First Storage Group\Mailbox Store (SERVER2K3)” is a corrupt file.
This file cannot verify.
Database or database element is corrupt”

In this case, its mean you lost your important data. The error message may occur due to one of the following reason:

1. You don’t have required permissions to access the database
2. Some of important Exchange Server files such as user permissions file go missing
3. Exchange Server database is corrupt and data can not be accessed from it

If you want to fix this problem, then you have only three options:

1. You have appropriate permission from the administrator and then try again.
2. You can repair your Exchange Server.
3. Repair Exchange Server database using Eseutil.exe tool

EDB corruption is one of the most critical situations and should be repaired. Eseutil.exe is an inbuilt Exchange Server utility that can verify and then repair the .edb files. But if you want to fix the errors or edb corruption then you have to go for EDB Recovery

Exchange Recovery Software recovers corrupted or damaged edb files of Microsoft Exchange Server. Stellar Phoenix Mailbox Exchange Server can recover all your emails, notes, contacts, journal, calendar entries and many other things from the corrupted edb files.

One of the best things in this software is that it supports Exchange Server5.5, 2000, and 2003. EDB recovery software is very user friendly and easy to use. Phoenix EDB Recovery software is compatible with Windows XP, 2003 and 2000.