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Occasionally, during the transition from Exchange Server 5.0 to Exchange Server 5.5, you might encounter the subsequent error notification:

-1206, JET_errDatabaseCorrupted

After encountering the previously mentioned error message during your attempt to upgrade from Exchange Server 5.0 to Exchange Server 5.5, the following error message will promptly appear on your computer screen:

We regret to inform you that an unforeseen error has arisen, bearing the unique identifier: c106fdda.

Reason: Error 0xFFFFFB4A JET_errDatabaseCorrupted

The error messages mentioned above are a result of damage to the Exchange database.


To address the error messages mentioned earlier, it is essential to verify the integrity of the priv.edb and pub.edb files. The following steps will guide you in confirming the status of these files:

  1. Copy the eseutil.exe and ese.dll files from the Exchange Server 5.5 CD and paste in the \exchsrvr\mdbdata folder.
  2. Open the command prompt window and navigate to the \exchsrvr\mdbdata.
  3. Now, execute the following command to check the state of priv.edb file:

    eseutil.exe /mh priv.edb | find State

    After the execution of preceding command is completed, execute the following command to confirm the state of pub.edb file:

    eseutil.exe /mh pub.edb | find State

  4. Note the location of .edb and .log files for the Information Store service and Directory service.
  5. Rename the Dsadata and Mdbdata on each drive to Dsadata1 and Mdbdata1 respectively.
  6. Create new Dsadata and Mdbdata folders on each drive.
  7. Uninstall Exchange Server.
  8. Install Exchange Server 5.0 with a new site but with the same organization.
  9. After completing the installation of Exchange Server 5.0, insert CD of Exchange Server 5.5 into CD ROM.
  10. Double-click the set up file of Exchange Server 5.5 and select Upgrade.
  11. After the setup process ends, stop the Exchange Server services.
  12. Execute the performance optimizer to move the .edb and .log files to their previous locations.
  13. Now, you need to rename the Dsadata and Mdbdata folders on each drive. Rename Dsadata as Dsadata2 and Mdbdata as Mdbdata2.
  14. After renaming the Dsadata and Mdbdata folders, create new Dsadata and Mdbdata folders on each drive.
  15. Now, copy the dir.edb file from Dsadata1 and paste into Dsadata.
  16. Copy priv.edb and pub.edb files from Mdbdata1 and paste them into Mdbdata.
  17. Now, start the System Attendant and the Directory Service.
  18. Now, switch to the command prompt window and navigate to \exchsrvr\bin folder.
  19. Execute the isinteg patch command.
  20. After executing the isinteg patch command, start Exchange Server services.
  21. Now, start the Exchange Server Administrator program.

Final words

Following the completion of the aforementioned steps, you will successfully resolve the -1206 JET_errDatabaseCorrupted error message. Nevertheless, when dealing with Exchange Server, you may encounter various other JET errors that could potentially result in data loss. To address these JET error messages effectively, consider utilizing Kernel for Exchange Server, a comprehensive Exchange recovery and repair software solution. This software not only aids in resolving JET errors but also offers EDB to PST conversion capabilities. Furthermore, it is compatible with a wide range of Microsoft Exchange Server versions, including 2016, 2013, 2010, 2007, 2003, 2000, 5.5, and 5.0.

Kernel for Exchange Server