Believed you are using Outlook 2000/2003 or even older client. You will need Public Folder in E2007created for Oulook 2003 and older version client to sync with Exchange for Free/Busy, Calendar and OAB. Cheers Poo

So the GAL and the OAB are incorrect right? Any issues seeing free/busy between 2k7 and 2k3? Also, check you app log for event ID 2080 source "MSExchange ADAccess" and make sure all your domain controllers are coorectly listed and appended with CDG 1 7 7 1 0 1 1 7 1 I had a similar, but not exactly the same issue where some AD perms were missing for exchange 07. the 2080 event showed 177100171

Is the old Exchange 2003 server left in the Organization? Did you replicate Public Folder system folders (ie Free/Busy, OAB etc.) to Exchange 2007? Did you move the OAB generating server from 2003 to Exchange 2007?

Is the administrative group that used to contain the public folder hierarchy still there? I saw something similar that happened after the migration was over and someone went in to ADSIEdit and deleted the First Administrative Group and that is where the Public Folders container lived.

I've had GAL update issues for Distribution Groups -seems to be that precarious connection between exchange 2007 and AD that wasn't an issue in Exchange 2003 (Then again a lot of things worked well in 2003 that don't in 2007). I'm not sure this will help but you have nothing to give up but a few minutes - Make some minor change to a user in AD who is not showing (not EMC) Right click on your OAB in EMC - and regen /update Wait 15 minutes Download the OAB in Outlook Send and receive See if that user is now in OAB

Does the default offline address list include the Default Global Address List? has the Default global address list been manipulated somehow? is the default offline address book set on the mailbox database object?

I have a similar issue, in that the GAL is up-to-date with AD, but since I turned off the Exch2003 server, any users using Outlook 2003, with Cached exchange mode enabled, do not have up-to-date GALs. By switching the user from cached, the GAL is showing up to date, but put the user back into cached mode, the GAL goes back to its previous out of date state.

Hi, In this case you need to make sure that the offline address book is being generated by the 2007 server - that you have a public folder store with a replica of the offline address book folders and that the generation works - can be seen in the event log. Leif

run these cmdlets and look for errors in application log. Set-EventLogLevel -Identity "MSExchangeSA\OAL Generator" -Level high Update-OfflineAddressBook -Identity "Default Offline Address book"

I found a way to correct this issue but I'm not sure if it is correct or best practice. It appears that some data is corrupted in the Active Directory for the Exchange mail-enabled public folders. I deleted these public folders and my OAB and GAL seem to be fine afterwords. I found a lot of old crud from public folders that were deleted long ago.Open the "Active Directory Users and Computers" management console.Click View and check "Advanced Features"Go to the folder "Microsoft Exchange System Objects"Delete all the folders that are causing the error messages that you listed. You will get a warning that the public folder will still exist but it will no longer be mail-enabled which seemed fine by me.