I found the following article from AccountingWeb to be excellent reading - both the article itself and the comments posted by the various contributors. Lots of content here if you are competing with any of the Sage line (or should I say "range") of products going forward.
Particularly interesting is their move to distance themselves from the Microsoft stack. This gives clearer ground than ever to differentiate our offering. Whether they like it or not, most customers have a significant proportion of the stack already installed, and we are uniquely positioined to help them exploit the power of our applications and infrastructure working together.