We just finished a transition from Exchange 2003 to 2010. All mailboxes are on the 2010 server but we have not shut down the 2k3 server in case some clients haven't checked in for their new settings. My problem is in OWA. When i look at the calendar in OWA the time is off 3 hours. Most of my searches point to exchange 2003 and the DST problems from a few years back. I wouldn't think that would be the issue since server 2008 should be patched for that already. Any ideas where to look next?