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Just to be clear, the new test account with at least 1 mail in the mailbox and does not have &quot;User must change password at next logon&quot; ticked gets the same error as you?<br />
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Have a look at the exchange VD directory permissions:<br />
<a href="http://support.microsoft.com/kb/937635" rel="ugc">http://support.microsoft.com/kb/937635</a>
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Just to be clear, the new test account with at least 1 mail in the mailbox and does not have "User must change password at next logon" ticked gets the same error as you?

Have a look at the exchange VD directory permissions:
http://support.microsoft.com/kb/937635 [http://support.microsoft.com/kb/937635]

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no. thats not new account. We tested with quite few accounts that are still on 2k3 exchange server and once we pointed autodiscover and owa to 2k10 server, all devices stopped working. They keep prompting for password and wont authenticate.
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no. thats not new account. We tested with quite few accounts that are still on 2k3 exchange server and once we pointed autodiscover and owa to 2k10 server, all devices stopped working. They keep prompting for password and wont authenticate.

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We also did the all the steps in the following article but getting error: unable to connect to server.<br />
<br />
<a href="http://technet.microsoft.com/en-us/library/jj715719(v=exchg.80).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/jj715719(v=exchg.80).aspx</a>
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We also did the all the steps in the following article but getting error: unable to connect to server.

http://technet.microsoft.com/en-us/library/jj715719(v=exchg.80).aspx [http://technet.microsoft.com/en-us/library/jj715719(v=exchg.80).aspx]

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Error: unable to connect to server. Active Sync problem with phones after we switched from 2k3 t o2010<br />
<br />
Please advice. phones are getting password prompt for credentials over and over and then gettting a message: unable to connect to the server....
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Error: unable to connect to server. Active Sync problem with phones after we switched from 2k3 t o2010

Please advice. phones are getting password prompt for credentials over and over and then gettting a message: unable to connect to the server....

unable to connect to server. Active Sync problem with phones after we switched from 2k3 t o2010

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.