Exchange 2010 EventID 9320 and 9359

During the generation of your Offline Address Book [OAB] you will see the following warning logged in the Exchange server responsible for generating the OAB:

Log Name:      Application
Source:        MSExchangeSA
Date:          05/07/2012 05:02:35
Event ID:      9320
Task Category: (13)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      SERVER.domain.com
Description:
OABGen could not generate full details for some entries in the offline address list for address list '\Global Address List'.  To see which entries are affected, set event logging for the offline address list generator to at least medium.

And the following one for many of your users:

Log Name:      Application
Source:        MSExchangeSA
Date:          05/07/2012 05:02:08
Event ID:      9359
Task Category: (13)
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      SERVER.domain.com
Description:
OALGen truncated or dropped properties for entry 'USERNAME' in address list '\Global Address List' because they exceeded the configured size limits for the version 4 offline address list.  The affected MAPI ids are:  8008.
- \Default Offline Address List

The possible affected MAPI IDs are:

  • 0x8CD8000D = PR_EMS_AB_AUTH_ORIG
  • 0x8008101F = PR_EMS_AB_IS_MEMBER_OF_DL_W

The example above with the 8008 ID is generated for each user in the OAB that is a member of a Distribution List [DL] and for each DL that has members.

This happened because the Active Directory attributes member and memberOf are not part of the truncated property list for regular groups. So when the OAB is being generated, this property is read but because Exchange can’t see it in the list, a 9359 event gets logged.

It looks like this is by design so, at the moment, there is no workaround or a way to suppress these warnings. The good news is that these warnings are expected, can be ignored and Microsoft has plans to address this!

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