Blog Post
Hi TKA
Thanks for dropping us a line about XP and this release. Hopefully I can shed some light on this for you.
When we stop supporting an operating system (in this case XP), it means we stop testing our software on that particular system. So, while it may still open and work fine, we won't guarantee that it will, and we don't recommend it.
So, in your case, you may find that you can still open your AR 2013.5 file using both your Windows 7 and XP computers, and may upgrade to 2014.1 and still find the same.
However (and this is a pretty big one), Windows decision to sunset support on XP means that continuing to use XP as an operating system may expose you to security issues (and yes, by security issues, I mean viruses and the like).
If you'd like more info - we've written a blog post about it. But basically, for your computer safety and the security of your AccountRight file, I'd recommend not opening your online file on XP, and upgrading your current XP computer to Windows 7.
Hope that helps.
Merrin