Exceeded the max number of %1 MDBs on this server.

Product: Exchange
Event ID: 9591
Source: MSExchangeIS Mailbox Store
Version: 8.0
Symbolic Name: msgidTooManyMDBsMounted
Message: Exceeded the max number of %1 MDBs on this server.

This Error event indicates that you have exceeded the maximum number of mailbox databases that can be mounted on one server. For more information, see your server configuration documentation.

User Action

To resolve this error, delete one or more mailbox or public folder databases. Be sure to keep at least one instance of the public folders if your site is running a version of Microsoft Exchange earlier than Exchange Server 2007. Be sure to back up necessary database (.edb) files and to move mailboxes as needed.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.


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