Hi all, Whenever a message from the System Administrator is delivered to an individual (such as a "mailbox over size limit" message Or "Undelivered message") if the user clicks on it to view the mail,Then Outlook 2000 will freeze.This is a W2K (SP4) server with Exchange 2000 (SP3)(upgraded from Exchange 5.5)Client PC have XP (SP2)& win2k.