HiI've been trying to troubleshoot this a few times with no luck.My OAB ain't too happy, I have two created - one works ok (only has one user in it) but the one that has all users doesnt. It is as though there is some corrupt entry in it of some sort. No OAB file is created at all.I have checked KB 318237 and all looks ok.I have also run oabinteg with the dumppdntable switch and it looks all ok (as far as i can tell)Total PDN's found: 0Total PDN's skipped: 0PDN Strings inserted into the PDN table: 0Duplicate PDN strings discarded: 0X500 entries skipped because they are NULL. This is valid and ok: 0I have also run oabinteg with the templatetest /2 /3 /4 switches and that all comes back ok.My clients are Outlook 2007.Just wondering if someone can point me in the right direction.Thanks for any pointers!

Wee update - i have narrowed the problem to one user's account.Anyone have any idea what to look for in the account's properties? Probbaly deep in adsiedit someplace...

Hi Dave, Check below article from Dave. It may help you specially How to Fix session.... OAB Generation and the 9339 event id http://blogs.msdn.com/dgoldman/archive/2006/06/14/OAB-Generation-and-the-9339-event-id.aspx