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Jon_AK

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Reply with quote  #1 
I am trying to disable the ability of the network clients from sending email in Rich Text Format (RTF).  Our network is Server 2016 with all Windows 10 x64 clients using O365 32 bit programs.  I found the GPO setting for what I thought would control this under: 

User Configuration->Policies->Admin Templates->Outlook 2016->Outlook Options->Mail Format->Internet Formatting->Message Format.

I set this from Not Configured to Disabled which the hellp text describes it as using HTML as the default message format and not allowing the user to change it.  I ran RSOP on a few client machines and everything showed as being applied successfully.  I cannot get this one to take.
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KingAlPal

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Reply with quote  #2 
Hi Jon,

You've found one of the less-than-intuitive aspects of Group Policy! You actually need to set this to 'Enabled', then choose the default message format. I've attached a screenshot for reference.

Alan B

Screenshot (348).png 

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Jon_AK

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Reply with quote  #3 
Thanks Alan.  I did not set it to enabled just because of the help text for this setting.  Setting it to enabled does work, guess I should have remembered that any subject help text from MS needs to be interpreted in the opposite.  Nothing like a puzzle is there?
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Jon_AK

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Alan, here is an update.  Apparently this policy setting only works on the Office Pro+ version of Outlook or in our case.... the E3 subscription version of Outlook.  I applied the policy which was passed along to all clients on the network, but I am the only one that has an O365 E3 subscription and thus I am the only one that is affected by this.  All the other clients have O365 Business subscriptions and they are not affected by this restruction.  I did find the registry setting to set Outlook to format messages as HTML and passed out that registry change as well but it only sets the default format and doesn't prevent the user from selecting RTF.  Not able to to find anything else to explain how to prevent Outlook from composing messages in RFT format or as MS calls it... TNEF.  I understand that Exchange online or for that matter, Exchange on premisis converts RTF formatted messages to HTML prior to sending but the problem lies with attachments.  With email composed as RTF (TNEF), the attachments wind up being placed into the body of the email message with no method to simply drag them out to save to a folder, you have to navigate to a folder location where you want it saved.  With messages formatted as HTML, the attachment is placed in the header of the email message where it can be dragged off to somewhere and that is what is being requested of me to ensure happens.  Any ideas?
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KingAlPal

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Reply with quote  #5 
Thanks for the reminder about that piece of licensing nonsense, Jon! I'd tripped over it once before, but had completely forgotten.
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