My question is similar to this question, but I would like to filter calendar notifications that came from applications other than Google Calendar. I have been successfully filtering Google Calendar notifications using the filter Has the words: *.ics ("Invitation:" OR "Accepted" OR "Declined"), but have not found a way to filter calendar notifications from Outlook users.

Edit: Here's a screenshot of an email invitation sent from MS Outlook. Unfortunately, since it's a work account, I can't include the message source. The only reference the source contains to "calendar" is Content-Type: text/calendar;. It appears as though Gmail is automatically parsing some information and creating the calendar box shown above the text of the email.

Calendar invite email from MS Outlook

  • I am currently testing out Has the words: +who +when +where +organizer +time and it seems to be capturing most - maybe all - of what I need. I'll continue testing this filter.
    – jwildman16
    Jan 5 '17 at 23:18
  • You need to find some unique part of the text to filter on. Maybe if you offered up a sample message someone could offer some suggestions.
    – ale
    Jan 6 '17 at 0:44

I'm not sure how I missed this previously, but the following filter seems to correctly catch all Microsoft Outlook calendar invites, updates, etc.

Has the words: filename:ics

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