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Hi,<br />
<br />
Depends on what is asking for credentials, when the security box is prompted what host name is in the titlebar?<br />
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Are the users who are getting the prompt local to the domain controller or connecting via VPN/Direct Access/etc?<br />
<br />
Event viewer errors on any of the servers?
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Hi,

Depends on what is asking for credentials, when the security box is prompted what host name is in the titlebar?

Are the users who are getting the prompt local to the domain controller or connecting via VPN/Direct Access/etc?

Event viewer errors on any of the servers?

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The users are local to the domain controller. &nbsp; It asks for username and password. &nbsp;I will check the event viewer errors in the morning and will let you know.
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The users are local to the domain controller.   It asks for username and password.  I will check the event viewer errors in the morning and will let you know.

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No errors in the event viewer.
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I was able to find a solution.
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Hi, we have an exchange 2007 server with office 2010 clients and LCS 2005 server. &nbsp; We've been having some issues where users get prompted for credentials. &nbsp;Does anyone know of any problems with this mix of environment? &nbsp;The fix is to close out of communicator, Close out of Outlook. &nbsp;Start outlook and then start communicator.
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Hi, we have an exchange 2007 server with office 2010 clients and LCS 2005 server.   We've been having some issues where users get prompted for credentials.  Does anyone know of any problems with this mix of environment?  The fix is to close out of communicator, Close out of Outlook.  Start outlook and then start communicator.

Exchange 2007/office 2010 /lcs 2005

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.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.