Malformed HTML in exchange server calendar invite

Question

I'm using javamail lib to send calendar invites. I notice exchange server adds this to the text/html part of the mail. The text/plain and text/calendar parts are not modified.

<meta name=3D"Generator" content=3D"Microsoft Exchange Server">
<!-- converted from rtf -->
<style><!-- .EmailQuote { margin-left: 1pt; padding-left: 4pt; border-left:=
#800000 2px solid; } --></style>

This behavior is not noticed when

• the invite is received by a non-exchange email like @gmail.com.
• when the exact text/html content is sent without the text/calendar part to an exchange email.

I believe exchange server is treating text/html in calendar invites differently, but I'm not able to find a solution that works for both exchange and non-exchange servers.

Answer 1

Outlook prior to 2016 always converted HTML in the meeting requests in RTF (which is/was the native body format for the appointments / tasks / contacts).

What version of Outlook and Exchange are you using?