Lenovo recommends Windows. 

Features

One tidy footprintFast accessFlexible viewing
Lenovo ThinkCentre A Series All-in-One desktop PCs save space and time.

What will you do with the other two-thirds of your desk?  After all, your new A Series system

likely only takes about one-third the space of your previous desktop. A Bluetooth keyboard

and mouse join a single power cord, eliminating the tangled web of the past.

Lenovo ThinkCentre A Series desktop PCs are easy to update and configure.

Time to service or upgrade your A Series system? Need access to your hard drive or

memory? Get it — fast — as only six screws stand between you and the interior.

Lenovo ThinkCentre A Series all-in-one desktops include monitor and CPU in one integrated unit.

An elevated desktop on a heightening stand, a wall-mounted screen, a monitor outstretched

with an arm — you can choose which A Series set-up suits you the best. The rest is up to you.

Lenovo’s business-centric ThinkCentre A70z all-in-one (AIO) desktop just might be the quick-booting, space-saving solution you're looking for

computer-shopper

 
Lenovo's Dilip Bhatia talks about the advantages of a business-class all-in-one.