Problem with mapped drive not showing up

Found out problem was related to Windows XP Professional Fast Logon Optimization feature. As a result, Windows XP does not wait for the network to be fully initialized at startup and logon. Existing users are logged on using cached credentials. This results in shorter logon times, but the problem was that account profile mapped drives did not show up for the logged on user.

To fix:

• Use gpedit.msc to turn off Fast Logon Optimization
• Go to the policy setting and ENABLE:
  Computer Configuration\Administrative Templates\System\Logon\ Always wait for the network at computer startup and logon

Reference: http://support.microsoft.com/kb/305293