Thank you for keeping me updated. Since cleaning of the free-busy information did not fix the issue, does this users domain have and configured their DNS hosting provider with and AutoDiscover Cname?

Here is some information on Autodisocver:
http://technet.microsoft.com/en-us/l...CHG.80%29.aspx

I have attempted to replicate your issue to no success. All attendees in my shared calendar, that I'm the owner of, show all free-busy info and the start and end times are available even if the meeting appointment occurs in the past. My domain does have Autodiscover configured.

If you can provide a screen shot of this occurrence,