QUESTION: How to configure Exchnage to support sending Task Requests (with RTF enabled) to external contacts AND NOT converting all other HTML-formatted messages to plain text?
Explanation:
We need to send task requests to external contacts ouside organization. Exchange does not support this unless you enable TNEF RTF for external contacts, e.g like this:
Set-RemoteDomain -TNEFEnabled $true
After I enabled RTF, external users receive task assigments fine (with Accept/Deny buttons). But any other messages sent in HTML format they receive in plain text only, which is major disadvantage. Even if we send formatted message from OWA to these external
users they receive message in plain text.
I have tried every possible combinations regarding TNefEnabled and UseMapiRichTextFormat setting. Also set exchange to use default settings, and set Outlook client "Internet Format" to RTF. But it also produced the described simptom.
More details about this issues are explained on the following Office365 support forum that I had already posted to, but since I didn't get any solution I wonder if I can get some tips from Exchange 2013 users:
http://community.office365.com/en-us/forums/148/p/194863/619577.aspx?PageIndex=1