How do I log in to mtalk app?

I did it this way: Access Windows Central forum with a browser. Login with your microsoft account and go to your account settings. Create a username (if you don't have one already) and change/create a new password. After this you can login with your new password. I don't know if there is an easier way, but this did it for me.

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I use it for about a month and I'm liking it a lot. You have a lot of forums in one place, you can post photos and video, follow links and it's fast.

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