Assume, for the sake of argument (dont ask why...answer is too embarrassing to my employer) that somebody is on XP
Would 2013 even launch? If so, what features/functions would not work?
I don't think it will even install. Not sure what error message it will give.
I've just done a quick test with one of my own applications and set that to install on Vista/W7/W8 only: Some of the details might be installer dependent. Mine just says 'xx cannot be installed on Windows <version list>, and goes to the dialog finish.
Office 2010 Will only install on Vista & newer so I wouldn't think Visio 2013 would install on an XP Machine
That is correct, Visio 2013 won't work on XP.
Nothing embarrassing about XP, most of our company machines are XP and have only recently moved to Office 2007!
I have to support a Visio app on XP, Vista, Win7 and now Win 8 and Visio 2003 (not Win 8), 2007, 2010 and 2013 (not XP).