FAQ / Server Products

When Exchange sends meeting requests to external users through Hexamail they no longer receive the .ics attachment, just a plain text email. What can I do?
Outlook not sending .ics when using POP/IMAP
http://support.microsoft.com/kb/284392

http://support.microsoft.com/default.aspx?scid=kb;en-us;290016&Product=out

http://social.technet.microsoft.com/Forums/ar/exchange2010/thread/2c7349d8-95b
5-4190-a678-1bc0b03f152a

http://social.technet.microsoft.com/Forums/zh/exchangesvradmin/thread/5f2d04ba
-8dc0-4030-b5f3-79b6b39165d9

Exchange not sending .ics:
http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/9bb
11982-4f74-49a6-8c5b-a70954aa4cef/

http://www.pcreview.co.uk/forums/sending-meeting-external-users-t1809572.html

There are also the following guides: