All fine and dandy
Unless of course your ancient business software was written using a sql server 2000 (80) compatibility level...
But of course at least you can run that in sql 2008 - not in 2012 and presumably not in 2014 if you can still get those versions.
Never had any uptime issues with 2005, 2008 or 2012. Worst performance issues was shoddy sql code and crappy "treat it like a file" dump it all into c# objects and do all the sorting / joining / calculating etc there. I don't understand why you still want an sql server at that point....