When you try to generate an offline address book (OAB) file that is larger than 2GB in a Microsoft Exchange Server 2010 environment, the generation process fails. Additionally, the following events are logged in the Application log on the Exchange Server 2010 mailbox server:
Log Name: Application Source: MSExchangeSA Date: Date Event ID: 9126 Task Category: OAL Generator Level: Error Keywords: Classic User: N/A Computer: Computer Description: OABGen encountered error 80070083 while calculating the offline address book for address list '\Global Address List'. This offline address book won't be available for client download. - \Default Offline Address List.
Log Name: Application Source: MSExchangeSA Date: Date Event ID: 9328 Task Category: OAL Generator Level: Error Keywords: Classic User: N/A Computer: Computer Description: OABGen encountered file error 80070083 (internal ID 5000398) while generating the offline address list for address list '\Global Address List'. Make sure there is enough disk space available. - \Default Offline Address List
This issue occurs because the OAB generation process encounters an issue when it tries to calculate the location in the OAB file at which to insert data. The OAB generation process encounters this issue when the extracted OAB file is larger than 2GB.
To resolve this issue, install the following cumulative update:
2661854 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
For more information about offline address books, visit the following Microsoft website: