Windows Phone Thoughts: Inbox/Contact email address problem?

Have any of you seen this issue? It generally happens with those that have an Exchange server behind Outlook, though I suppose Notes users could be susceptible. The internet email address for internal users in your contacts gets munged. For a contact with "[email protected]" for the email, it will periodically get changed to "/o=CompanydomainE2K/ou=First Administrative Group/cn=Recipients/cn=ehansberry." You never notice it until you try to send an email, and of course it bombs. The "/o=CompanydomainE2K...." address is how Exchange sees the user, but why would that be coming back to the Contacts field?