We are running Exchange 2007 and 2010 during a slow migration. Both have OWA running. I have an external client machine running Windows 7 32-bit with IE8. The user could reach their mailbox through OWA on via https://Ex2k7 server.company.com/owa from that client machine or any others. Once the mailbox was moved to the Exchange 2010 server, the user puts in the https://exch2010.company.com/owa from teh same machine and gets a web page could not be found. Using any other machine, the user can hit the https://exch2010.company.com/owa. I can't find where it is failing. Any ideas?