In Outlook you have the option of saving your password to prevent having to log in each time you launch Outlook. When you choose to save your password in Outlook by placing the check mark next to “save password” Outlook simply adds an entry to the Windows Credential Manager or Stored Usernames and Passwords manager.
If you wish to remove the saved password or if the save password option did not work when selected in Outlook please complete the following steps:
1. Close Outlook
2. Open Credential Manager or Stored Usernames and Passwords
In Windows 7, Choose Start > Control Panel > Credential Manager.
In Windows XP, Choose Start > Control Panel > User Accounts > Your Windows Username > Manage my network passwords.
3. Remove all saved entries referencing your Exchange Server Credentials. They may appear in the following formats:
4. Restart Outlook and enter your credentials, choosing to either save or not to save your password.