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Are you using &quot;outlook anywhere&quot; in your client's outlook account settings? If yes, you will need to turn if off. If users are asked for username and passwords and they type them in then are essentially connecting to Outlook anywhere (https session) if it is turned on. But if your clients restart outlook that should fix the problem for them.<br />
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It could be a domain controller issue as well. Check to see if your DC has a flat CPU in performance graph. Users will be struggling to authenticate during this DC performance issue and will be prompted for credentials.
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Hi Rezwan,<br />
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I think I've posted the same thing before. Also, solutions for client side, and server side. So clients would not be bothered if he stop the service before rebooting.
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Thank you. &nbsp;That worked!
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@Dejan - mate, my posting was only 2 minutes after you. Of course I didn't refresh my screen before posting mine. Your idea of stopping RPC service is nice though. Thanks
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Every time I reboot our Exchange 2003 server, Outlook shows a prompt for password down in the bottom. &nbsp;If the user clicks on this prompt, Outlook reconnects. &nbsp;Any ideas how to resolve this issue?
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Every time I reboot our Exchange 2003 server, Outlook shows a prompt for password down in the bottom.  If the user clicks on this prompt, Outlook reconnects.  Any ideas how to resolve this issue?

Outlook 2010 Prompting for password after Exchange 2003 reboot

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.