Summary: Exchange database may fail to mount due to missing log files or various other reasons. In this post, we’ve discussed the stepwise procedure to recover inconsistent Exchange data and resolve failed to mount database issue by using Exchange utilities. We’ve also mentioned about an Exchange recovery software that can help you restore Exchange database, if Exchange utilities fail.

Exchange server admins may face various issues, such as unable to mount Exchange database, while trying to mount the mailbox store or public folder store in MS Exchange 2010, 2013, 2016 or 2019 server. This often leaves them in a crisis, as the users are unable to access the mailbox data stored in the database.

A common error faced by administrators while attempting to mount the mailbox store database is as follows:

Exchange is unable to mount the database that you specified. Database: 0f770558-4961-4a57-9008-2549f8f19116; Error Code: MapiExceptionCallfailed: Unable to mount database. (hr=0x80004005,ec=-528)

The error occurs when the Exchange database is not cleanly shut down as a result of an unexpected power failure or crash. This indeed makes the database to go into a 'Dirty Shutdown' state. In other cases, you may find the necessary transaction log files missing or deleted, which are not committed to the database. This causes transactional inconsistency in the database and leads to mounting problems.

Common Reasons behind Exchange Failed to Mount Database Issue

Exchange server may fail to mount a mailbox database (.EDB) file due to the following reasons:

  • Disk space issues
  • Missing logs
  • Antivirus and Backup software are not application-aware
  • Hardware and software failure
  • Malware or Ransomware
  • Sudden power cut
  • Human error

To resolve this issue, you can verify the database consistency by running 'Eseutil /mh' command against the database.

If the database has been shut down properly and showing ‘Clean Shutdown’ state, you should move the Checkpoint file and all log files to some other folder and try mounting it again. However, if it shows ‘Dirty Shutdown’, then you must recover the Exchange database and bring it to consistent state.

You can also use an Exchange recovery software, such as Stellar Repair for Exchange to recover mailboxes from damaged or inconsistent Exchange databases. You can then export the repaired mailboxes to Outlook PST format or directly to live Exchange server or Office 365.

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The software provides an easy solution for such problems. It quickly fixes corruption in the suspected Exchange database. It helps to get the Exchange server back by restoring everything, without incurring any further damage to the database. It supports all Exchange versions, such as Exchange 2019, 2016, 2013, 2010, 2007, 2003, and 5.5.

How to Recover Inconsistent Exchange Database and Resolve Exchange Failed to Mount Database Issue?

If the database is in a 'Dirty Shutdown' state,

  • Try restoring from the recent backup
  • Perform a soft recovery or hard recovery

If you try restoring database from the backup, you can lose the data that was received after the last backup.

You can perform a soft recovery on the database by using the EseUtil /r or a hard recovery by using the EseUtil /p. However, hard recovery should only be performed as a last resort as it will purge all the data which is flagged as corrupted, apart from the fact that there is no guarantee that the database will mount after the process.

What to Do if EseUtil and ISINTEG Utilities Failed to Fix the Problem?

In case you failed to mount the database by using EseUtil or ISINTEG utilities, use Exchange Server Database Recovery Tool to repair and restore damaged database. The steps are as follows:

  • Create a new database for your users so that they can start receiving and sending new emails
  • Install Stellar Repair for Exchange on the server or another machine
  • Scan the dismounted or inconsistent mailbox database using Stellar Repair for Exchange.
  • Preview and then export the recovered mailboxes directly to a new database on live Exchange server (in the same forest or server).

Eseutil is a great utility to recover and mount an inconsistent database. However, it may or may not work based on the severity of database corruption. If soft recovery fails to recover an inconsistent database, it is advisable not to perform hard recovery as it can lead to significant data loss. Instead, you can download and install Stellar Repair for Exchange software that extracts mailboxes from an inconsistent Exchange database (EDB) and saves them in PST format. It can also export the mailboxes directly to another live Exchange server or Office 365 account in a few clicks. The software provides an option to map mailboxes and create new mailbox if the mailbox is not available on the destination server database. This can ultimately help you fix the unable to mount database issue in Exchange without any risk of data loss.

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