I am working on an Inter-Org migration from Exchange 5.5 to Exchange 2003. The customer requires that OWA be available for some users via the Internet and Intranet, but for some users OWA should only be available on the Intranet (users have a VPN connection). With Exchange 2000, there was a way to provision OWA access for internal use only. Refer to following tech article for more details. http://support.microsoft.com/default.aspx?scid=kb;%5Bln%5D;830827
However, this capability does not seem possible with Exchange 2003 because the Web DAV address check is not present in Exchange 2003. I know I can disable the http protocol, but then users cannot access OWA at all. Is there a way to allow some users to access OWA internally, and others to use OWA both via the Internet and Intranet? We are migrating to Exchange 2003 SP2. One workaround may be able to post two different URLS, and have the internal one only on the internal DNS, so it is not accessible from the outside. But if users know what the external posted URL is, they will would be able to get into OWA from the Internet.
Thanks for any suggestions.