Well, if it helps I've bought two PC's, on seperate occasions, from Mesh in the past and never had any bother with them. They were both delivered on time, complete and working....and still do, had one about 4 years and the other about 2 1/2 years.
Ability office is not Microsoft Office...but it's compatible...in other words you can create files with Ability Office and still use them in MS Office. And I'm sure you'll understand it if you've used MS office at all.
Mesh have been going for a while now and produce some great machines, and no supplier has a 100% perfect record...look at some of the other postings on here..