Re: Great point he's making
Ummm... I don't get this.
Why should every new version of an OS support every bit of software that ever ran on previous versions?
The world moves on, technology moves on. A payroll or accounting package that was released back in 2001 alongside XP may no longer be compatible with modern legislation/requirements (electronic submission of returns to HMRC for example) so you'd need to update/replace it anyway.