Choosing Server which supports Virtualization and my requirements

Hello,

I am new to this form and Virtualization. I want to buy a new server which i will use in my business, and i am planning to have 7 machines using Vsphere Hypervisor with given capabilities.

1. Active Directory of 10,000 Users( Authentication Only)

2. FTP for 7000-8000 users

3. Mail Server for 200 users

4. Inventory System

5. 3 Machines with 2 cores each and 3 GB of RAM

Thanks

Sandeep Singh