emmygee - I updated from 8.1 to 10 and haven't had any problems. I still have Skype - in fact the only thing is that I can't unpin it from the taskbar and when I started it up to check it was OK, it wanted me to add a photo of myself. I managed to ignore this.
Keith - I have unpinned Edge from the taskbar but it's not shut down, it's still listed in the apps, however, I didn't have any problems when I upgraded to 10. I use Mozilla and the icon was still on the taskbar so I just click on that to open it and everything is the same. The desktop view is the same with all the shortcuts I had still there.