Hello all After a recent update to our new exchange 2007 server whenever users try accesing our webmail link (https://mail.*********.com/owa), they get prompted for basic authentication prior to the normal owa login screen. I've tried removing the basic authentication setting from the owa site within IIS and just leaving the windows authentication on the active site within owa however that will not let anyone authenticate. It seems i have to have the basic authentication set at some point (users have to enter their credentials, then enter them again at the normal login screen) for people to access their mail, obviously this isn't ideal so if anyone could give me an idea on how to resolve this that would be great as my IIS skills are a tad limited! Thanks in advance Matt Smith

I had the same problem did the following and now it just logs in once. Exchange Management Console > Server Config > Client Access > OWA > Properties > Authentication Under Forms-based Auth, select Username only, add in your domain... press ok out and viola...

I had similar issue with upgrading to exchange 2010. I have resolved it with basic authentication only. It seems form based authentication has issue's. My setup was already on domainname\username which did not resolve it for me.