We have a mixed Exchange 2003/2010 environment. Somehow we have managed to lose the OAB. Now neither Exchange server seems to want to create an OAB....half of my users are on 2010 and half on 2003. Some of the issues are: - New AD users are not appearing in the GAL. - Can't download GAL in Outlook. Get 0x8004010f error message. - Some of the 2003 users calendar events are not automatically being marked tentative and do not appear on their calendar. Have not seen this issue with 2010 users. How do we get the OAB to work properly?

Have you replicated the system public folders to the new Exchange server? If not, then you need to. That will be the reason for both OAB and Free/Busy information not being shown. Outlook looks to the same server that has its mailbox for that information, and if it isn't there, it throws the error you have posted - which means cannot find. http://www.amset.info/exchange/oab-error.asp Simon. Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

Hi Check out this link, it's very good in troubleshooting 0x8004010f http://msexchangeteam.com/archive/2007/04/19/437902.aspxJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi, I understand that the OAB doesn't work in your scenario, and the meeting request was not marked as tentative status in certain Exchange 2003 users. To handle the issue properly, we need to troubleshoot it one by one. For the OAB issue, Is the issue occurred in OWA or Outlook under Online Mode? Are all the users (Exchange 2003 and Exchange 2010) experiencing the issue? Where is the OAB generation server? Was any error message received in the Event log on the OAB generation server? Thanks Allen

Followed this link and original steps with a few extra steps. 1. Create a public folder store in exchange 2010 (or use the default, created when you install exchange 2010 mailbox role) 2. Point the new mailbox stores in the exchange 2010 to use the exchange 2010 public folder store. 3. Use the system manager console, from exchange 2003 to add the public folder store of 2010 to all public folders in your organization. After these step you can move mailboxes to 2010. 4. Move public folder hierarchy to the exchange 2010 administrative group. After moving all mailboxes to 2010 you can start deleting all public folder stores in 2003. To do that please use system manager console: 1. move all replicas from 2003 public folder store 2. delete public folder store. My extra steps were: 5. Changed matching external FQDN A record to internal Exchange server IP on internal DNS server. 6. Set autodiscover record to be CNAME pointing to external name A record. 7. New mailboxes did not have x400 selected due to 2010 not having policy. Checked box for x400 on individual mailboxes and created policy to have x400.

Hi, Thanks for your sharing. Allen