Disable or Change MSSTD Mutual Authentication in Exchange 2007 Outlook Anywhere Autodiscovery

http://www.agileit.com/Blog/Lists/Posts/Post.aspx?List=c12b6877-9140-4536-b226-b3e11ff929a3&ID=278&RootFolder=%2A&Web=b8624129-0cec-4b70-9743-b27ca84c4802

Fix: Set the correct Principle Name in PowerShell

From the Exchange Command Shell:

Set-OutlookProvider EXPR -Server $null -CertPrincipalName msstd:internal.company.local

This will correctly set the Mutual Authentication to the correct value as documented in the screenshot above.

Alternate Fix - Disable MSSTD checkbox in Outlook Anywhere (not recommended) in Powershell

Set-OutlookProvider EXPR -Server $null -CertPrincipalName none