Event Id1087
SourceMSExchangeIS Mailbox Store
DescriptionThe 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.
Event InformationIn the database Properties, indicate that the database is allowed to be restored by clicking the appropriate check box.

Fore more information refer the Microsoft articles given below.
Reference LinksDatabase Does Not Mount After You Restore an Offline Backup

XADM: Information Store Fails To Start With 1011 Error


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