Running Exchange 2003 sp2 on Server 2003 R2 sp2.
Since approx. June 6th 2010 users logging in to OWA have to use DOMAIN\username where previously only had to use username. As said this was working up to the weekend, also it only happens using IE 7 &8, firefox works just fine. Mobile access etc still OK.
All the setting on IIS and Exchange are good, I set it up a few years ago with the default domain and has been working since.
Has anyone else seen this issue over the last week?