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Were security updates applied recently? It sounds like this...<br />
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<a href="http://exchangemaster.wordpress.com/2013/12/02/outlook-2013-security-update-breaks-out-of-office-for-exchange-2007-mailboxes/" rel="ugc">http://exchangemaster.wordpress.com/2013/12/02/outlook-2013-security-update-breaks-out-of-office-for-exchange-2007-mailboxes/</a>
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Were security updates applied recently? It sounds like this...

http://exchangemaster.wordpress.com/2013/12/02/outlook-2013-security-update-breaks-out-of-office-for-exchange-2007-mailboxes/ [http://exchangemaster.wordpress.com/2013/12/02/outlook-2013-security-update-breaks-out-of-office-for-exchange-2007-mailboxes/]

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I have one Exchange 2007 Server. &nbsp;I recently upgraded all clients to Office 2013. &nbsp;Ever since the upgrade when users use Out of Office via Outlook 2013 it says Server Unavailable.<br />
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OWA Out of Office works perfectly.<br />
<br />
What could this be?
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I have one Exchange 2007 Server.  I recently upgraded all clients to Office 2013.  Ever since the upgrade when users use Out of Office via Outlook 2013 it says Server Unavailable.

OWA Out of Office works perfectly.

What could this be?

Out of Office Server Unavailable

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.