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I am trying to create a .msg file, preferably using MsgKit, that is a calendar invite. As I understand it, it needs to be a MIME message with only one (main) text/calendar part. How can I do that? Specifically:

  1. Is the MIME component the Appointment.Save() byte array?
  2. Do I then put that in an Email object? If so, where/how?

The security warning Outlook pops up for an .ics file is:

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Firstly, MIME and MSG file formats have nothing in common - the former is a text file that you can open in Notepad, the latter is a binary OLE (IStorage) file.

If you can help it, try to go with MIME - it is so much easier to deal with and you don't need any libraries to create. If you want to have an example of what Outlook itself produces, try to send a meeting invitation to a Gmail address and then look at the raw message source in your Gmail account.

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I did as you suggested and looked at the raw email sent. It has a text/plain, text/html, and text/calendar block. And the text/calendar is a base64 encoded .ics file. The .ics file has several X-MICROSOFT- lines. Before I go to all the work writing code to create this, will this then give me a file that Outlook will view as an invite with no Security warning? TIA.
What security warming do you mean? A warning like "A program is trying to ..."? Or a warning prompting you to open an attachment?
I am still not sure why you want an attachment - if the MIME message is properly formatted, Outlook will see it as a meeting invitation instead of a regular message with an ICS attachment.
My use case is as follows. The user signs up for an event. They get a link for the event (full page display). On that page I want to have 3 links: Download .ics, Google Calendar event link, Event to add to Outlook. I've seen web pages that have this where it's a .msg file (for a .ics file Outlook puts up a scary security warning). I don't care if this is a file like .ics or a link like Google, but I want something where they click on it, if a file open it, and it's an event for Outlook. With no security warning. Does that make sense? TIA
Which security warning do you mean?
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