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Outlook 2010 error - Outlook must be online or connected...

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After you setup Exchange Server 2013 and try to connect to it using Outlook 2010, you may receive this error:

“The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.”

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This error can be addressed (assuming your environment is configured correctly and AutoDiscover is working as expected), by applying April 2010 update for Outlook 2010.

You can find more details here: http://www.bhargavs.com/index.php/2012/11/14/outlook-must-be-online-or-connected/