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EventID 9646 - exceeded the maximum of 500 objects of type 'objtFolder'

    Question

  • The Exchnage server prompts the following error:

    Data               : {91, 68, 73, 65...}
    Index              : 268496
    Category           : General
    CategoryNumber     : 6
    EventID            : 9646
    EntryType          : Error
    Message            : Mapi session '/o=WDW/ou=XXXX/cn=Recipients/cn=xxxxxx' exceeded the maximum of 500 objects of type 'objtFolder'.
    Source             : MSExchangeIS
    ReplacementStrings : {/o=WDW/ou=XXXX/cn=Recipients/cn=xxxxxx, 500, objtFolder}
    InstanceId         : 3221628334
    TimeGenerated      : 11/24/2009 9:17:33 AM
    TimeWritten        : 11/24/2009 9:17:33 AM
    UserName           :
    Site               :
    Container          :

    When I run the mailbox statistics of this mailbox, this mailbox does not contain more than 500 folders.  It only contians 20~30 folders and each of these folders only contains less than 500 messages.  As well, no sepcial add-in is added to the Outlook client.

    So, what does the 'objtFolder' refer to?  Number of total folders in a mailbox?  Or else?


    Tuesday, November 24, 2009 2:06 PM

Answers

  • I wouldn't just go changing the registry key as this is simply masking the problem.  Go to the user in question and see what they're doing.  Last time we saw this it was due to the user's Outlook client having the "download shared folders" option enabled like Raj said earlier, causing shared mailbox contents being downloaded locally.  Also, the other thing that often causes this is when the user has 3rd party desktop search programs enabled, hammering the server, etc.
    Neil Hobson, Exchange MVP
    • Marked as answer by wizard kurtz Monday, November 30, 2009 2:48 PM
    Wednesday, November 25, 2009 8:17 AM

All replies

  • Have seen this multiple times. Changing the registry key

    HKEY_LOCAL_MACHINE \SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem according to this KB http://support.microsoft.com/?kbid=830829 will help. But also check if this person is accessing any shared mail box and also any automated series of emails.

    Raj
    Tuesday, November 24, 2009 4:05 PM
  • Hi Raj,

    Thanks for your reply.  Yes, I can change this key.  But my question is what the number of 'objtFolder' refers to.

    When I run the mailboxstatsics of the user's mailbox that reported to have issue, below shows the result.  Neither exceeding number of folders nor exceeding number of items is found in the emailbox.


    Identity                                                          ItemsInFolder
    --------                                                          -------------
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                     254
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                     222
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                     143
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      92
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      53
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      52
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      31
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      26
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      24
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      16
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      15
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      14
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      14
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      14
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      14
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                      10
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       9
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       6
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       6
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       4
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       4
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       1
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxxxx\                                     0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    /o=YYY/ou=XXXX/cn=Recipients/cn=xxxx...                                       0
    Wednesday, November 25, 2009 1:11 AM
  • Its not about the number of items in the folder. See the explanation here http://support.microsoft.com/?kbid=830829
    Raj
    Wednesday, November 25, 2009 6:32 AM
  • I wouldn't just go changing the registry key as this is simply masking the problem.  Go to the user in question and see what they're doing.  Last time we saw this it was due to the user's Outlook client having the "download shared folders" option enabled like Raj said earlier, causing shared mailbox contents being downloaded locally.  Also, the other thing that often causes this is when the user has 3rd party desktop search programs enabled, hammering the server, etc.
    Neil Hobson, Exchange MVP
    • Marked as answer by wizard kurtz Monday, November 30, 2009 2:48 PM
    Wednesday, November 25, 2009 8:17 AM
  • Yep, and you can use Exmon from the server to get a realtime view of the connections as well:
    http://www.microsoft.com/downloads/details.aspx?FamilyId=9A49C22E-E0C7-4B7C-ACEF-729D48AF7BC9&displaylang=en

    Wednesday, November 25, 2009 1:53 PM