Office Communicator shows this error when connection from outside the company network.
Error:
Communicator could not retrieve calendar or Out of Office information from Exchange Web Services. Communicator will automatically continue to retry. If this problem persists, contact your system administrator.
There are few pages with related questions and solutions:
http://forums.microsoft.com/unifiedcommunications/ShowPost.aspx?PostID=2032370&SiteID=57
http://forums.microsoft.com/unifiedcommunications/ShowPost.aspx?PostID=2274628&SiteID=57
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