W
Windows Central Question
I tried a lot of things posted here and there on Microsoft web pages and seems no one really knows how!
Try on outlook.com. Click the grid icon in upper left corner and go to People. Click Manage drop down menu at the top. Then click IMPORT. Then try importing from there using the option to import from OUTLOOK or WINDOWS LIVE MAIL. Both gives you option to import CSV files. Though not sure if yours is FULLY compatible, but worth a shot.
If you're signed into your Microsoft Account on your phone or computer, the People app should take a day, give or take, to sync them all.
GL!