As Lily has said I have no decision, although our opinion is taken into consideration. 
 
 I only support 160 servers for the mail side of this for less than 1/2 of the mail users in the company. So lets say there's a good 400-500 servers just for mail, let alone the rest of the infrastructure.
 
 Currently 41,000 seats on dell servers all going to HP servers, unfortunately dell still supply the desktops/laptops, and I'm not even going to start on those!!