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How to Include Optional Attendees in Calendar File when Converting It to MHT

Save a calendar ICS or Msg to MHT using MhtFormatOptions.WriteHeader | MhtFormatOptions.RenderCalendarEvent produces something like the following example:
The output doesnt show Optional attendees. Could some one help me with displaying Optional attendees along with the following information in MHTML file genereated using RenderCalendarEvent

Subject: Test Appointment
Location: [https://consilio.zoom.us/j/test ](https://consilio.zoom.us/j/test)
Start: Fri 10/01/2021 08:30 PM
End: Fri 10/01/2021 09:00 PM
Show Time As: Busy
Organizer: John
Required Attendees: Mary

Thank you for contacting support. We will answer you as soon as possible.


We have reproduced the issue and started working on a fix. The EMAILNET-40440 task is registered in the Email project tracker. We will notify you as soon as the issue is resolved.

Starting with upcoming version 21.10, optional attendees will be displayed in output MHTML for MhtFormatOptions.WriteHeader | MhtFormatOptions.RenderCalendarEvent options.

Also, you will be able to disable them in the following way:

// MhtSaveOptions 
options.FormatTemplates[MhtTemplateName.OptionalAttendees] = "";

The issues you have found earlier (filed as EMAILNET-40440) have been fixed in this update.