I have recently been looking at a couple of Warning events in our Exchange 2007 Server Application Event Log. These particular events, Event 9372 and Event 9320 often appear together and refer to the OAL, Offline Address List, Generator.

The first event is Event ID 9327 which doesn’t tell us much as the logging level is currently set to the minimum (Lowest) level.

Event Type: Warning
Event Source: MSExchangeSA
Event Category: OAL Generator
Event ID: 9327
Description:

OALGen skipped some entries in the offline address list ‘Global Address List’. To see which entries are affected, event logging for the OAL Generator must be set to at least medium.

- Offline Address Book

The next event, which appears alongside the above event, is Event ID 9320 – again on the OAL Generator.

Event Type: Warning
Event Source: MSExchangeSA
Event Category: OAL Generator
Event ID: 9320
Description:

OALGen 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, event logging for the offline address list generator must be set to at least medium.

- Offline Address Book

To resolve these problems I needed more information. The first step in finding more information is to increase the Event Logging detail for the Offline Address List General using the command

set-eventloglevel “MSExchangeSAOAL Generator” – Level 5

Once this was set I used Exchange Server to rebuild the OAL in the Exchange Management Console under Microsoft Exchange->Organization Configuration->Mailbox->Offline Address Book). Right click and select update – this took only a few seconds in our system.

Checking the Application Event log now revealed the real two problems – Event 9323 and Event 9325.

First, to deal with Event 9323 which was stating “Entry ‘username’ has invalid or expired e-mail certificates.” and sure enough firing up Active Directory Users and Computers and checking under the Published Certificates path for the particular user showed two expired certificates. Removing them then updating the OAL again cleared the problem.

The next event, Event 9325 stated, “OALGen will skip user entry ‘username’ in address list Global Address List because the SMTP address ‘’ is invalid.”. The problem address turned out to be a Mail Contact and disabling then recreating the contact details then updating the OAL again cleared this particular problem.

The last thing to do was restore the logging for the OAL Generator to its minimum (as it generates quite a few event log messages when set to level 5).

set-eventloglevel “MSExchangeSAOAL Generator” – Level 0