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Event ID 9646 – MSExchangeIS

Closing Mapi session "/o=First Organization/ou=First Administrative Group/cn=Recipients/cn=XY" because it exceeded the maximum of 100 objects of type "objtAttachment".

Closing Mapi session "/o=First Organization/ou=First Administrative Group/cn=Recipients/cn=XY" because it exceeded the maximum of 250 objects of type "objtMessage".

Troubleshooting:

1. A new feature in Exchange 2003 to help prevent any one client from acting "abnormally" and adversely affecting the performance of the server. The recommended fix was to modify the registry to raise the threshold for each one of the object types mentioned in the error message.. The resolution can be found this link: Event ID 9646 is logged when you try to send many messages in ...

2. This issue occurs if the Exchange Store.exe process cannot resolve the GUID to an msExchMailboxGuid attribute or to an objectGUID attribute. The Store.exe process may not be able to resolve the GUID if sibling domains exist in the same forest. A sibling domain is another domain that exists at the same level in the forest. When the Store.exe process tries to resolve the GUID, the Store.exe process sets the BaseDN parameter of the Lightweight Directory Access Protocol (LDAP) query to a value that is equal to the domain naming context of the user. If the Exchange server is in a sibling domain, the LDAP query returns no results. The resolution can be found here: The description of the event ID 9646 message includes a GUID ...

3. It could be the connectivity issue too.

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