Event ID - 9650

Event Id9650
SourceMSExchangeIS Mailbox Store
DescriptionMessage delivery is being attempted. Internet Msg Id:ID, Submit Time: 03/16/2004 17:30:01.0000000, Recipient:/o=PlankyOrg/ou=First Administrative Group/cn=Recipients/cn=username, MDB:First Storage Group\Mailbox Store (Computername). For more information, click http://www.microsoft.com/contentredirect.asp.
Event InformationAccording to Microsoft:
RESOLUTION:
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem.Only apply it to systems that are experiencing this specific problem.You must restart the computer after you apply this hotfix.
To enable this hotfix for the mailbox store, follow these steps:
1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type DisableDuplicateDetectionOver255 bytes for the name of this registry entry, and then press ENTER.
5. Right-click DisableDuplicateDetectionOver255 bytes, and then click Modify.
6. In the Value data box, type 1, and then click OK.
7. Quit Registry Editor.
To enable this hotfix for the public folder store, follow these steps:
1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPublic
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type DisableDuplicateDetectionOver255bytes for the name of this registry entry, and then press ENTER.
5. Right-click DisableDuplicateDetectionOver255bytes, and then click Modify.
6. In the Value data box, type 1, and then click OK.
7. Quit Registry Editor.
Reference LinksSome of the messages are not delivered when you send several messages in Exchange Server 2003

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