Re: It also knackers...
When I forwarded the info to El Reg yesterday evening (the email I received from Sage only mentions Sage 50 Accounts) the possibility of other versions being affected didn't occur to me, but it did this morning.
I don't know anything about 200 because I've never used anything beyond 50 - but I have also used Instant in the past and, AIUI, Instant is more or less a cut down version of 50, so I don't see why that wouldn't also be affected.
Where I'm working today, they use Instant for invoicing - it's run on four computers (legitimately licenced for each, before anyone asks!) using a shared backup system, with one being the 'active' user at any one time1. Three of the computers are running Windows 8, and one of them Windows 10 - and AFAIK (as in nobody's asked me why "it's broken") it's working.
Then again, the email about Sage 50 only said it affected some users, so that it's working here doesn't prove anything.
Another factor could be the specific version; I run Sage 50 Accounts Plus 2013 - so a few years old (and long since out of Sage Cover). I've never upgraded, or continued with cover, because of a disagreement I had with Sage a few years ago2. The version of Instant this company uses is a couple of years newer. *Shrugs*.
1. I want to move them to something else, but I haven't found anything suitable yet - and I have been considering whether I can write something suitable myself. (I've written custom invoicing software for other clients in the past, but this company would need something completely different to any of those.)
2. A disagreement over their mishandling of my email address - the upshot of which is that they were supposed to have scrubbed it completely from their records. Apparently, since they sent me that email, they didn't do this quite so completely after all. I should be annoyed by that, but under the circumstances, I'm glad they didn't.