- Outlook will prompt for the location of OST and maybe PST if in the profile
- ActiveSync on Windows mobile will need to be set up with the new username
- If using roaming profile, you will need to rename all users folders (so you need access to them which is by default prohibited with XP SP2)
- If redirecting My Documents, you will need to rename all folders to match.
- Update logon script if network mapping is based on the username
- You may clean up all profile on all station or at least rename them.
You should always test amont a significant numbers of users first to check against application troubles after renaming accounts. Applications like Vmware VirtualCenter always display the last used username.