Outlook 2003 losing POP3 password after User account password change

Hi all,

Got a bit of a strange one.

After one of my users changes there account password Outlook 2003 asks for all the pop3 account passwords.

Once they are entered it works fine until the account password needs changing again.

All users are using HP Laptops running Outlook 2003, Windows XP and are on an SBS2003 network.

Anyone come across this before?

Chris