No roaming profile ?

Today I troubleshooted a roaming profile error, i.e. the profile wasn't copied back to the share on the server. No errors (or popups) came during logon/logoff and the user account had full access to the share.

After some investigations I noticed that the user account was member of the "Domain Guests" build in group. Apparently this group membership makes the roaming profile to be temporary (and never saved to the share). Due to the lack of error messages (or information messages) this was hard to find out of.

I have searched the Internet for some good information about "Domain Guests" but didn't find much useful information:

• Using Default Group Accounts
  http://technet.microsoft.com/en-us/library/bb726982.aspx
• Profiles for Members of Guests Group Are Deleted
  http://support.microsoft.com/kb/165398