Read the statement by Michael Teeuw here.
Outlook.com calendar
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 Nevermind, I ended up adding (not importing the calendar to my google calendar) and then got the share .ics link from there 
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 Ah yeah, unfortunately outlook.com has removed the ability to export calendar for some dumb reason. Seems to have happened after the server changes, and their helpfiles have not been updated. I fired up Outlook 2016 (the program), loaded up the account and used that to export the calendar. 
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 Just in case someone is looking for the ability to use the outlook.com calender. 
 It works but unfortunately without any birthdays (if the birthdays are part of the contacts).
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 @killing-joke How does it work? Are you using the “Export to Gmail” method mentioned above or some other method? 
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 hello, I am using an outlook addon which is gsyncit to synchronize my outlook calendar to gmail calendar. no problem with the mirror which contains the gmail calendar. 
