Installed to our internal owa server... to find that owa is not working anymore. Blank page.. Exact same symptoms as with RU2
"When you install Update Rollup 2 for Exchange 2007, you experience the following symptoms:
After the installation of Update Rollup 2 for Exchange 2007 is complete, users cannot log on to Outlook Web Access. In this scenario, the users are redirected to a blank Web page that has a URL that resembles the following:
https://servername/owa/auth/logon.aspx?url=https://servername/owa&reason=0
"
but no fix yet... :(
Funny thing is that our external owa page which is accessed through isa to a different server is working fine even after the upgrade.