I have recently moved a client to Server/Exchange 2008/2007 and now blackberry and other mobile devices can not connect to exchange for mail. I ran the microsoft exchange rpc/http connectivity analizer and came up with this error.
Testing Http Authentication Methods for URL https://remote.lislearchitecture.com/rpc/rpcproxy.dll
Http Authentication Test failed
A Web Exception occurred because an HTTP 404 - NotFound response was received from IIS7
Any help would be much appreciated!