Wednesday 8 December 2010

SBS 2003 – MSExchangeIS Error 9646 – Exceeded Maximum Objects

One of our SBS 2003 sites had the following in their morning report:


In the Event Logs we found:


Event Type:    Error
Event Source:    MSExchangeIS
Event Category:    General
Event ID:    9646
Date:        12/8/2010
Time:        9:46:25 AM
User:        N/A
Computer:   SBS
Mapi session "/o=DOMAIN/ou=first administrative group/cn=Recipients/cn=FirstLast" exceeded the maximum of 32 objects of type "session".

For more information, click

A quick search turned up:

The instructions were as follows:

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate and then click the following registry subkey:


  3. If the Maximum Allowed Sessions Per User entry does not exist, do the following:
    1. On the Edit menu, point to New, and then click DWORD Value.
    2. Type Maximum Allowed Sessions Per User as the entry name, and then press ENTER.
  4. Right-click the Maximum Allowed Sessions Per User entry, and then click Modify.
  5. Click Decimal, type the value that you want to set in the Value data box, and then click OK.
  6. Exit Registry Editor.
  7. Click Start, click Run, type services.msc in the Open box, and then click OK.
  8. Click the MSExchange Information Store service, and then click Restart Service.

We configured the registry setting at 96. The default is 32.

Once we restarted the Information Store the user could connect to Exchange in their Outlook 2007.

Philip Elder
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book

*Our original iMac was stolen (previous blog post). We now have a new MacBook Pro courtesy of Vlad Mazek, owner of OWN.

Windows Live Writer

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