When a user in a Microsoft Exchange Server 2003 organization performs a Send/Receive operation in Microsoft Outlook, the user may receive the following error message:Additionally, one or both of the following events may be recorded in the Application log.

Event ID 9360

Event ID: 9360
Category: OAL Generator
Source: MSExchangeSA
Type: Error
Machine: SERVER_NAME
Message: OALGen encountered an error while generating the changes.oab file for version 2 and 3 differential downloads of address list "\Global Address List". 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\SYSTEM\CurrentControlSet\Services\MSExchangeSA\Parameters\OAL post full if diff fails" 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.

Event ID 9331

Event ID: 9331
Category: OAL Generator
Source: MSExchangeSA
Type: Error
Machine: SERVER_NAME
Message: OALGen encountered error 8004011b (internal ID 5020114) accessing the public folder store while generating the offline address list for address list '\Global Address List'. - Default Offline Address List

Note These events are logged only if diagnostic logging for the OAL Generator category in the MSExchangeSA service is set to the maximum logging level in the Exchange System Manager.

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This issue may occur if an error occurs when Exchange Server 2003 generates changes to the .oab file. If this error occurs, Outlook may not download the Offline Address Book.

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
To resolve this issue, follow these steps on the server that is running Exchange Server 2003:

1.	Click Start, click Run, type regedit in the Open box, and then click OK.
2.	Locate and then right-click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeSA\Parameters
3.	Point to New, and then click DWORD Value.
4.	Type OAL post full if diff fails to name the new value.
5.	Right-click OAL post full if diff fails, and then click Modify.
6.	In the Value data box, type 1, and then click OK.
7.	Exit Registry Editor.
8.	Dismount and then mount the Public Folder Store again. To dismount and then mount the public folder store, follow these steps: a. Start Exchange System Manager. b. Expand Servers, expand the server that you want, expand Storage_Group_Name, and then right-click Public Folder Store. Note If administrative groups are defined, follow these steps: • Expand Administrative Groups. • Expand Administrative_Group_Name. • Expand Servers. • Expand the server that you want. • Expand Storage_Group_Name. • Right-click Public Folder Store. c. Click Dismount Store, and then click Yes to continue. d. Right-click Public Folder Store, click Mount Store, and then click OK.

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