After you restore an offline backup of the information store, the database may not mount, and the following events appear in the application log:

Event Type: Error
Event Source: MSExchangeIS Mailbox Store
Event Category: General
Event ID: 1087
Description:
The information store was restored from an offline backup. Indicate that the database is allowed to be restored to, in the Microsoft Exchange System Manager, so that it can be patched.

-and-

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9519
Description:
Error 0x3f3 starting database /o=OrgName/ou=First Administrative Group/cn=Configuration/cn=Servers/cn=ServerName/cn=Microsoft Private MDB on the Microsoft Exchange Information Store.

-and-

Event Type: Information
Event Source: MSExchangeIS
Event Category: General
Event ID: 9541
Description:
The Microsoft Exchange Storage Group /DC=COM/DC=MICROSOFT/DC=DNS/DC=DOMAINNAME/CN=CONFIGURATION/CN=SERVICES/CN=MICROSOFT EXCHANGE/CN=ORGNAME/CN=ADMINISTRATIVE GROUPS/CN=FIRST ADMINISTRATIVE GROUP/CN=SERVERS/CN=SERVERNAME/CN=INFORMATIONSTORE/CN=FIRST STORAGE GROUP is off-line.

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To restore an offline backup, you must allow the database to be overwritten during a restore procedure. Follow these steps to enable this option:

1.	Start the Exchange System Manager.
2.	Expand Servers, expand Server Name, expand Storage Group, and then click the database that was restored.
3.	Right-click the database, and then click Properties.
4.	Click the Database tab.
5.	Click to select the This database can be overwritten by a restore check box.
6.	Click OK.
7.	To mount the database, right-click the database, and then click Mount Store.

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Unlike Exchange Server 5.5 and earlier, you do not need to run isinteg -patch after you restore an offline backup.

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