Have just done a Exchange 2003 to Exchange 2010 migration (the organizational already had 2010 somewhere, this was just one local country site).
After that, some users can't access free busy information, it works fine from OWA. From the user's Outlook clients they just get a message saying free/busy information cannot be displayed. Also OOF doesn't work for some users (but does for others).
When browsing to http://exchangeserver/autodiscover/autodiscover.xml, i can authenticate fine with most mailbox credentials (and it comes up with error 600 code like it's supposed to), but for some users i can't authenticate at all with it (using the same credentials to login to OWA).
There is nothing unusual in the logs or anything, and I've tried recreating the virtual directories.
Thanks in advance,
You can also try to run Test-Outlookwebservices -id theuserthatdoesntwork
Post the result in here
Please tell me did you have few clients of outlook 2003 also, because for Free/Busy information for the outllo 2003 clients we required public folder in Exchange 2010.
Check for the autodiscover service is working or not & try to restart the Microsoft Exchange Active directory topology service & then try again,
I hope this will help you,
If you find this is helpfull for you, please mark it as answers.
Arun Chaudhary MCP, MCTS, MCITP Microsoft Exchange Corporate Trainer India