SSL Certificates play a big role in a Citrix Password Manager deployment. They help to ensure the password data in the central store is genuine and they also allow for encrypted communications between the Password Manager service and the Password Manager agent. There are lots of things that can go wrong with certificates that will stall your Password Manager deployment.
This change was required on the Exchange 2007 Client Access Server (CAS) in order for clients to accept the wildcard certificate that through the Autodiscover Service (AS) for Outlook Anywhere.
Dealing with certificates on a Windows Mobile device can be somewhat of an adventure. For starters, no version of Windows Mobile supports wildcard certificates.