We are having an issue since we migrated to Exchange 2007 with the OAB download on some of our clients. We are currently using Outlook 2003 in cached mode. The problem is not widespread, as most clients have no issues at all. However, we seem to have about 5-10 clients per week that are not getting the OAB updates and then we need to rebuild the Outlook profile to fix the issue. So far, none of them have been repeat issues and we cannot find a commonality between them.Has anyone run into a similar problem?

I have ran into similar questions in the past. Have a read, answer maybe in herehttp://blog.meigh.eu/2010/03/01/administering-the-offline-address-book-in-outlook-2003-and-outlook-2007-cached-mode.aspx

Hi,Please try to use OABInteg to troubleshooting Offline Address Book (OAB) generation issues on the Microsoft Exchange Server, and OAB download problems on the Microsoft Outlook client.We need to run the tool from Outlook Client side.OABInteg and how to use it to troubleshoot OAB generation issues.http://blogs.msdn.com/dgoldman/archive/2005/08/28/oabinteg-and-how-to-use-it-to-troubleshoot-oab-generation-issues.aspx How to use OABInteg's oabfldcheck and proxytest to troubleshoot OAB Generation issues and Missing objects after an OAB downloadshttp://blogs.msdn.com/dgoldman/archive/2007/03/08/how-to-use-oabinteg-s-oabfldcheck-and-proxytest-to-find-oab-issues.aspx Regards, Xiu