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Did you tried the solution mentioned in the link below:<br />
<br />
<a href="http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/2d35acc0-3c68-4e60-a6df-43b760f20be3/" rel="ugc nofollow">http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/2d35acc0-3c68-4e60-a6df-43b760f20be3/</a><br />
<br />
Sudeep
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Did you tried the solution mentioned in the link below:

http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/2d35acc0-3c68-4e60-a6df-43b760f20be3/ [http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/2d35acc0-3c68-4e60-a6df-43b760f20be3/]

Sudeep

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Hello, <br />
<br />
Recently installed a 2013 Exchange server and migrated some mailboxes to it. <br />
<br />
What I have noticed is the two mailboxes located on 2013 cannot access each others Shared Calendars or the free/busy data. In the top tab it begins to update then states &quot;No Connection&quot;<br />
<br />
When I log into OWA I can see the exchange the above functions just fine. <br />
<br />
I have tried re-creating the outlook profile on 2013 and the problem persists. All other functions work and I can view calendars for users on the 2007 Exchange server just fine (vice versa)<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2013/06_w23/658022/noconnection.jpg" target="_blank" title="No Connection (16 KB)"><img alt="No Connection" class="file-block lazyload" style="max-width: 263px;" data-src="https://filedb.experts-exchange.com/incoming/2013/06_w23/658022/noconnection.jpg" /></a>
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noconnection.jpg

Hello, 

Recently installed a 2013 Exchange server and migrated some mailboxes to it. 

What I have noticed is the two mailboxes located on 2013 cannot access each others Shared Calendars or the free/busy data. In the top tab it begins to update then states "No Connection"

When I log into OWA I can see the exchange the above functions just fine. 

I have tried re-creating the outlook profile on 2013 and the problem persists. All other functions work and I can view calendars for users on the 2007 Exchange server just fine (vice versa)



No Connection error

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.