Change status, which Skype 8 can (and I'd vote for more than just DND and Invisible, which are all that Skype 8 can do, but that's been made very clear in another thread).

Also, when hovering over Skype 8, the tooltip simply says the name of the program. That's unneeded and unhelpful, so copying that behavior isn't ideal. Skype 7's tooltip shows the status. Though that's not really needed if you implement color changes in the icon. I hate to keep mentioning Skype 7, but its color (and even the design) changes according to status.

So, it's good to see the Win10 app finally start chipping away at what the Skype 8 app can already do. There's a pretty long list to go, however, before they're at parity, and I expect by that time, Skype 8 will have added features to keep its lead. I'm glad you're not blocking the use of Skype 8 on Win10 any longer (it was a half-hearted block, but an annoying one), since many on Win10 are going to use it over the app.