The information store was restored from an offline backup.In the Microsoft Exchange System Manager, indicate that the database “” is allowed to be restored to, so that it can be patched.

Details
Product: Exchange
Event ID: 1087
Source: MSExchangeIS Mailbox Store
Version: 6.5.6940.0
Component: Microsoft Exchange Information Store
Message: The information store was restored from an offline backup.In the Microsoft Exchange System Manager, indicate that the database “<name>” is allowed to be restored to, so that it can be patched.
   
Explanation

This event is typically seen during server recovery and/or restore situations. It indicates the store detected an offline backup that needs to be patched but the “This database can be overwritten by a restore” option was not checked. If the option “This database can be overwritten by a restore” is checked, then the store process automatically patches the offline database and mounts it. It also logs an event 9524 indicating that the database was successfully patched.

The “This database can be overwritten by a restore” option was not checked before attempting to mount the database.

   
User Action

In Exchange System Manager, go to the properties of the particular store and, on the database tab, place a check mark against the option “This database can be overwritten by a restore“.

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