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Outlook has been working perfectly with Exchange. Suddenly, I can't login, my password is rejected every time.

Most likely, your Outlook is timing out while attempting to connect to the Exchange server. This can be caused by many variables, including but not limited to; local and remote network loads, quality of network service, cpu and memory bottle necks on the mail client’s host computer.

To resolve this problem, increase the Outlook 2007 "Seconds Until Server Connection Timeout" value.

1) Open the Windows Control and double click the Mail icon to open the Mail Setup window.
2) Click on Email Accounts button.
3) Select email account by clicking one time on the Exchange Email Account to be changed.
4) Click one time on the Change button.
5) Click one time on the More Settings button.
6) Make certain the General Tab is selected.
7) Towards the bottom the window there is a textbox labeled "Seconds Until Server Connection Timeout". Change this setting to twice its current value. Should be a value between 60 and 180 Seconds.

8) Click Ok, Click Next, Click Finished, Click Close, Click Close