On Exchange you might see the following error logged, event ID 9646.  This error is caused by a users mailbox having over 500 folders and sub-folders. Here is the event log:

Msexchangeis eventid 9646: mapi session exceeded the maximum of 500 objects of type “objtfolderview"
MSExchangeIS EventID 9646: Mapi session exceeded the maximum of 500 objects of type “objtFolderView" 1

Solution:

To resolve this issue create the following registry keys on each of your mailbox servers:

  • Navigate to HKLM > System > CurrentControlSet > Services > MSExchangeIS > ParametersSystem.
  • Create a new key in ParametersSystem named MaxObjsPerMapiSession.
  • In MaxObjsPerMapiSession, create a DWORD named objtFolder with a decimal value of 600.
  • Create a second DWORD named objtFolderView also with a decimal value of 600.

The Information Store will pick up the changes after a few minutes. No need to reboot the Informational Store.

Hope it helps.

    wpChatIcon

    Discover more from COLLABORATION PRO

    Subscribe now to keep reading and get access to the full archive.

    Continue reading