I have an Exchange 2007 SP1 server with 200+ clients. Exchange server is also a DC w/GC. Most clients are Outlook 2003 using RPC and have no issues. Have several windows mobile devices syncing their data with no issues. Have blackberries sync their data with no issues. OWA functions as expected. Outlook anywhere functions as expected. The Server and the clients are separated by a 3mb WAN link.
I have 5 users using Outlook 2007 clients all configured to use RPC ( RPC over HTTP is disabled on the Outlook 2007 clients ). 2 users, experience no login prompts ever. 2 others experience an ocasational random login prompt. 1 experiences frequent random login prompts. When the login prompt in displayed outlook is not longer updated and the status bar says "need password". It is not an autodiscover.xml issue, I have run diagnostics and all urls are correct for the certificate on the server. I have reviewed the permissions on the IIS virutal directories All looks normal I can even log onto a different machine, and the random login prompts follow the user. Help!