As an experiment, I decided to take advantage of Microsoft's current upgrade price and upgrade my Windows XP partition to Windows 8 Pro. I have to say that the upgrade was successful and without issue. My LMDE partition is totally intact and dual booting works fine. The only thing is that the Grub menu lists the Windows partition as XP still, but that doesn't matter to me.
I would like to be totally on Linux (which I use most of the time), but need Windows for certain applications ..... mostly media. So for those who have been considering the upgrade, it can be done rather painlessly
Mr. Lawrie Mann
Partition 1: Linux LMDE/Mate
Partition 2: Windows 8 Pro