We are running running Exchange 2003 SP2 and moving to Exchange 2010 in one of our companies, which is made up for three AD sites. Something we are looking at is having CAS servers that users can access via either Forms Based Authentication -OR- Integrated Windows Based Authentication. Thus, one URL (e.g. https://webmail.mycompany.com) would use FBA, and another (https://companymail.mycompany.com) would use IWA. Does anyone know if this is possible?

Perfectly possible You will need to setup a second web site then use new-owavirtualdirectory to configure the OWA directories. That will mean an additional IP address on the NIC so that you can bind the two web sites to an individual IP. I would suggest that the new web site is used for all public access, so FBA for OWA, Outlook Anywhere, EAS etc - then use the new site for your internal traffic only. Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

Hi, Yes, you can set different authenication for two web sites on one server. http://blogs.technet.com/b/exchange/archive/2011/01/17/configuring-multiple-owa-ecp-virtual-directories-on-exchange-2010-client-access-server.aspxPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.