I'm writing this for those few folks out there running virtual machines under a VirtualBox host. I waited until the last dying moment to upgrade simply because my universe is on a Win7Pro instance and truthfully, I didn't trust Microsoft. I'll provide the few steps I did here to maybe help.
1) You need to google and see if there are any conditions your machine doesn't qualify for. You need sufficient Us, ram and available disk space. I had plenty, 4 us, 6G, and about 3TB of disk with a lot of it empty.
2) make a FULL backup of your old system, not just a snapshot. Google it if you're not familiar.
3) the executable from Microsoft (you won't have a choice).
4) shut down your instance, go into settings and change the VERSION to Win10 and start it back up.
5) If you have Avira or some other antivirus running, turn off the realtime protection.
6) launch the executable you ed from Microsoft. There was a dialog or two in the beginning but once those are done, you're in for a wait. Go watch TV or something and check back every hour or so. Mine took 4 hours to finish.
All my software and apps seem to work fine. I opened my MS Office and got a nag about licensing. Just click the activate over the Internet and that should be resolved (verified assuming legal copy) almost instantly.
You may have issues with the virtual graphics card. if you see the warning, just chose continue. Once the installation completes, you will need to mount or go to your Guest Additions image and run the VBoxWindowsAdditions-[your u] in order to get more choices on screen size. Assuming you want Full Screen on your Instance, select from the VBox Guest Menu, View/AutoResize Guest Display. Alternatively, you can select a fixed size by right clicking the desktop and going into the Display settings and choosing from the available options. VirtualBox can control your display size or Windows can, your choice. I'm a full screen person so I used VBox's AutoResize capability.
Anyway, it was uneventful. The look and feel is a bit different than Win7 but I got it close to my comfort zone so I'm happy; no Cortana, cleaned up the Task bar to MY LIKING. Hopefully you will be happy as well, other than being forced into this update. Hope this helps.
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