Consider the following scenario:
- You install Microsoft Exchange Server 2010.
- You delegate some management roles.
- The delegates have Full Access permissions to some mailboxes.
- The delegates perform actions on the mailboxes at the same time.
- The actions generate copy-on-write delegate access requests and create many admin sessions. For example, more than 10,000 admin sessions are created.
- You try to run an Exchange Server cmdlet. For example, you try to run the Test-MapiConnectivity cmdlet to verify server functionality in a mailbox.
In this scenario, the cmdlet may fail. For example, one or more of the following events are logged in the Application log when you try to run the Test-MapiConnectivity cmdlet:
Source: MSExchange MailTips
Message: Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: MailTips query failed for mailbox Mailbox. Latency: total:7. The returned exception is: Microsoft.Exchange.Data.Storage.TooManyObjectsOpenedException: Cannot open mailbox /o=Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=Computer/cn=Microsoft System Attendant. ---> Microsoft.Mapi.MapiExceptionSessionLimit: MapiExceptionSessionLimit: Unable to open message store. (hr=0x80040112, ec=1246)
Source: MSExchange Mailbox Replication
Message: The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.
Error: MapiExceptionSessionLimit: Unable to make connection to the server. (hr=0x80040112, ec=1246)
This problem occurs because the maximum number of admin sessions on the Exchange Server 2010 mailbox server is 10,000. Therefore, no more admin session can be created when 10,000 copy-on-write delegate access requests to the mailboxes are issued.
To resolve this issue, download and install Update Rollup 4 for Exchange Server 2010 Service Pack 2. For information about how to download and install Update Rollup 4 for Exchange Server 2010 Service Pack 2, visit the following Microsoft website:http://www.microsoft.com/en-us/download/details.aspx?id=30478
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Test-MapiConnectivity cmdlet, go to the following Microsoft website:
For more information about Update Rollup 4 for Exchange Server 2010 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base: 2706690
Description of Update Rollup 4 for Exchange Server 2010 Service Pack 2
Article ID: 2726897 - Last Review: September 4, 2013 - Revision: 4.0
- Microsoft Exchange Server 2010 Standard
- Microsoft Exchange Server 2010 Enterprise
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