Hi,
lese Dir mal bitte folgenden Auszug durch!
Outlook Web Access includes optional functionality that allows a user to change the password. If a user changes the password during an Outlook Web Access session, the cookie provided after the user initially logged on will no longer be valid. When forms-based authentication is configured on ISA Server, the user who changes the password during an Outlook Web Access session will receive the logon page the next time a request is made.
http://www.microsoft.com/techn…4/plan/owapublishing.mspx
Gruss
Heinz