Microsoft Outlook Prompts for Username and Password

In a Microsoft Exchange Environment, Outlook may ask you for log on credentials over and over again.
It is very common that this happens because you have stored an invalid or different password in your Vault sometime in the past. Maybe you did not even notice or pay attention (e.g. persistent net use or runas in cmd etc.).

The Problem:

To remove that do the following:

On Windows 7:
1\ Open Control Panel and Click on “User Accounts”

2\ Click on “Manage Windows Credentials”

3\ Find the stored password for your Exchange Server / Domain and click the expand icon.
4\ Click “Remove From Vault”


On Windows XP:
1\ Open Control Panel and Click on “User Accounts”

2\ Click on “Manage Passwords”

3\ Highlight the Exchange and / or Domain password and click “Remove”

Other potential issues can be found on this nice post:
http://demazter.wordpress.com/2010/02/09/outlook-continually-prompting-for-username-and-password-2/

Applies to:
Microsoft Outlook 2003
Microsoft Outlook 2010
Windows XP
Windows Vista
Windows 7

2 responses to Microsoft Outlook Prompts for Username and Password

check if Exchange System Attendant service is running, it happened to me after server restart, service did not start automatically and warning was not displayed.

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