Mailbox store will not mount on startup

Topic Last Modified: 2007-01-08

The Microsoft® Exchange Server Analyzer Tool queries the Active Directory® directory service to determine the value for the msExchEDBOffline attribute of all objects with a class of msExchPrivateMDB. Objects with this class are mailbox stores.

A value of True for the msExchEDBOffline attribute indicates that the mailbox store will not be mounted automatically when the Microsoft Exchange Information Store service starts. A value of False indicates that the mailbox store will be mounted at startup. If the Exchange Server Analyzer finds the value for this attribute to be True, a warning is displayed.

This warning indicates that the Do not mount this store at start-up check box is selected. This check box is on the Database tab of the mailbox store Properties dialog box. When the check box is selected, the mailbox store will not be mounted automatically when the Microsoft Exchange Information Store service starts. The next time the Microsoft Exchange Information Store service is started, for example after a restart of the server, a mailbox store with this attribute set to True will not mount. We recommend that mailbox stores mount automatically when the Microsoft Exchange Information Store service is started.

To correct this warning for Exchange 2000 Server or Exchange Server 2003

Open Exchange System Manager.
Expand Servers, and then expand the server that contains the mailbox store you want to modify.
Expand the storage group that contains the mailbox store you want to modify.
Right-click the mailbox store, and then click Properties.
On the Database tab, clear the Do not mount this store at start-up check box.
Click OK to save the setting.
Close Exchange System Manager.

To correct this warning for Exchange Server 2007

Open Exchange Management Console
Expand Server Configuration and then select the server that you want to work with.
Expand the storage group that you want to work with.
Right-click the database that you want to work with, and then click Properties.
On the General tab, clear the Do not mount this database at start-up check box.
Click OK to save the setting.
Close Exchange Management Console

For more information about this option, see the following Microsoft Knowledge Base articles:

314218, "HOW TO: Turn Off or Turn On Automatic Mounting of Data Stores at Startup in Exchange 2000 Server" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=314218)
285169, "XADM: Information Stores Do Not Mount After You Use the "/disasterrecovery" Switch" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=285169)