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Try reviewing an article composed by one of our members regarding what it sounds like you're describing. <br />
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<a href="https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html" rel="ugc">https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html</a>
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Try reviewing an article composed by one of our members regarding what it sounds like you're describing.

https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html [https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html]

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Lots of questions need to be asked to narow this down but to sart I would suspect you IP possibly changed after reboot? &nbsp;Check your IP info and make sure you have the ports on your switch open for that IP. Also make sure you are logging in with the right domain. When loggin in with Outlook log in with domain\username in the username box and then put in password. 
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Lots of questions need to be asked to narow this down but to sart I would suspect you IP possibly changed after reboot?  Check your IP info and make sure you have the ports on your switch open for that IP. Also make sure you are logging in with the right domain. When loggin in with Outlook log in with domain\username in the username box and then put in password.

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I have just rebooted my exchange , everything was working fine before &amp;&nbsp;now outlook will not connect to exchange it seems.<br />
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I can connect via OWA, but not outlook. When I open outlook 2010 it asks for an authentication box. I put my logon details in there &amp;&nbsp;it doesnt work &amp;&nbsp;i dont get any errors, it just wont connect.<br />
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All servives seem to be connected from what I see.<br />
<br />
Any ideas? It's quite urgent.
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I have just rebooted my exchange , everything was working fine before & now outlook will not connect to exchange it seems.

I can connect via OWA, but not outlook. When I open outlook 2010 it asks for an authentication box. I put my logon details in there & it doesnt work & i dont get any errors, it just wont connect.

All servives seem to be connected from what I see.

Any ideas? It's quite urgent.

Outlook 2010 cannot connect to Exchange 07 , gives prompt box

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.