Trouver sur : http://www.tek-tips.com/viewthread.cfm?qid=348582
1. Go into Exchange System Manager
2. Expand to your Server under admin
(Administrative Groups>> DOMAIN-NAME
3. Right click on DOMAIN-NAME folder, Properties.
4. Your going to see an Exchange Service Account
(with Administrator listed)
5. Click MODIFY
6. Retype your password, verify password.
7. Hit OK, OK, close out System Manager.
8. Restart Exchange services.