User account is locked out.
Cause: There may be too many failed logon attempts.
Solution: Unlock the user account.
To complete the following procedure, you must be logged on as a member of the Domain Admins security group.
To unlock a user account
On a computer running Windows Small Business Server 2003, click Start, and then click Server Management.
In the console tree, click Users.
In the details pane, right-click the user account that is locked out, and then click Properties.
On the User Properties page, click the Account tab.
Clear the Account is locked out check box to unlock the account.