|Message:||OALGen encountered an error while generating the %1 file for version 2 and 3 differential downloads of address list ‘%2’. The offline address list has not been updated so clients will not be able to download the current set of changes. Check other logged events to find the cause of this error.
If the cause of the problem was intentional or cannot be resolved, OALGen can be forced to post a full offline address list by creating the DWORD registry key ‘HKEY_LOCAL_MACHINE\%3\%4’ and setting it to 1 on this server. When OALGen next generates the offline address list, clients will perform a full OAB download. After that time, the registry key should be removed to prevent further full downloads.
For Microsoft Outlook clients that are running Office Outlook 2003 Service Pack 1 (SP1) or earlier, if a Microsoft Exchange server that is running Exchange Server 2003 Service Pack 2 (SP2) determines that a differences download is more efficient, and if a differences file cannot be generated on a server that is running Exchange 2003 SP2, Exchange Server will not automatically force a full offline address book (OAB) download. Instead, Exchange logs MSExchangeSA event 9360. MSExchangeSA event 9360 indicates that it was unable to produce a differences file and will not produce a full OAB file.
When this event is logged, the users running Outlook 2003 SP1 or earlier will not be able to receive OAB updates until the problem is corrected.
The offline address list has not been updated, so clients will not be able to download the current set of changes.
To resolve this error, do one of the following:
Before you edit the registry, and for information about how to edit the registry, see Microsoft Knowledge Base article 256986, Description of the Microsoft Windows Registry.
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.