In an Exchange Server system, corruption may creep into your database anytime as a result of several hardware or firmware related issues. Oftentimes, there are problems within the storage subsystem caused by firmware upgrades, controller issues, memory upgrades or failures, and the like. These problems introduce page-level damage into the Exchange database files. This may lead to a checksum mismatch during a page read operation and subsequently record Event ID 474 in the application log of the Event Viewer:
‘Event ID: 474
Information store "2680" the database page read from the file "~\mdbdata\priv1.edb" at offset 4050944 (0x00000000003dd000) for 4096 (0x00001000) bytes failed verification due to a page checksum mismatch.’
At this stage, you may not be able to start the Exchange Message Transfer Agent (MTA) service on your Exchange Server computer. An Event ID 474 error indicates that a problem in the hard-disk subsystem has caused damage to your Exchange database.
In order to rectify this problem and bring your database back to a consistent state, follow the below mentioned procedure:
If you do not have the database backup or the above procedure fails to mount the Exchange mailbox store, use Stellar Exchange Mailbox Recovery Tool to recover all your lost invaluable Exchange data. The software repairs damaged Exchange databases (.EDB) files for extracting various user mailboxes and restoring them as individual Outlook PST files. It recovers all types of mail items, such as messages, contacts, notes, tasks, calendar entries, and journal records.
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