All was well, until we changed the domain of our primary email server. Systematically changed the email address settings in the Active Directory entries for each named user and much to our chagrin, SharePoint foundation is not polling for the new user information.
Search, search, search and yes, this is a limitation in foundation and there are some scripts, etc. that suggest a solution, but they seem out of date or otherwise not working.
This is a small deployment, but cannot seem to find how to get SharePoint to sync the user accounts with Active Directory, particularly the new email addresses? All help appreciated and somewhat glad we found this now, email address changes do happen; we better learn how, now.