Exchange 2007 Mapi Session for iOS and Android Clients

posted Aug 15, 2013, 9:59 AM by Andrew Chadick
If you are getting an unusual amount of Application error messages in your exchange event logs for:
Mapi session .... exceeded half of the maximum of 16 objects of type "session".  You can increase this number EAS session limit to address/lessen the number of messages.

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate and then select the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
  3. On the Edit menu, point to New, and then click DWORD (32-bit) value.
  4. Type Maximum Allowed EAS Sessions Per User, and then press ENTER.
  5. Right-click Maximum Allowed EAS Sessions Per User, and then click Modify.
  6. In the Value data box, type 25, and then choose Base Decimal, then click OK.
  7. Exit Registry Editor.
Note: By default the value is 16.

  • Click Start, click Run, type services.msc in the Open box, and then click OK.
  • Click the MSExchange Information Store service, and then click Restart Service
  • APPLIES TO
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
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