Mailbox database will not mount on startup

A user is�not able to access a mailbox that resides on a particular database after a restart of the�Microsoft Exchange Information Store�service on a Microsoft Exchange 2010 Server.

A mailbox database on this server is not configured to mount upon startup of the Microsoft Exchange Information Store service.

1. Open Exchange Management Console
2. Expand Microsoft Exchange On-Premises and then expand OrganizationConfiguration and then Select Mailbox
3. On the Database Management tab, Right-click the mailbox database that you want to work with, and then click Properties.
4. On the Maintenance tab, un-check the Don't mount this database at startup check box.
5. Click OK to save the setting.
6. Close Exchange Management Console

For more information on this topic, see the following document from Microsoft TechNet online:

Mailbox store will not mount on startup
http://technet.microsoft.com/en-us/library/aa995861(EXCHG.80).aspx

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