Windows Server 2008 R2
Windows Server 2008 is the most robust and most secure version of Windows Server yet! Windows Server 2008 R2, which rests on the same Windows codebase as Windows 7, has expanded the feature set of Server 2003 and added functionality. Windows Server 2008 R2 was designed for a Windows 7 client network. Several built-in features in Server 2008 R2 make managing, deploying, and securing Windows 7 clients a breeze.

Microsoft uses a "secure by default" model with the new Server 2008 R2 operating system. On a new installation of Server 2008 R2, no "Server Roles" are installed by default. Only the roles which are absolutely required for that server to perform it's selected functions are installed, one by one, to cut down on wasted system resources, increase speed, and reduce possible attack surface.

Windows Server 2003
Windows Server 2003 R2 provides best of breed performance, scalability, and security right out of the box. Windows Server 2003 R2 makes significant improvements over Windows 2000 with a number of kernel enhancements that make an identically equipped 2003 box 100% faster than a Windows 2000 Server! We also love the new Terminal Services capability that is built into Windows Server 2003, which now includes full 16-bit audio and 24-bit video. Windows Server 2003 R2is the basis of our education solution, which allows schools to cut their costs by 75%!

VMWare ESX/ESXi
VMWare maximizes your server hardware investments by letting you run multiple virtual servers on a single physical server. This allows you to purchase one physical server and use it to host many virtual servers. Instead of putting a web server, Exchange server, and domain controller on 3 separate servers, you can install them all on a single, powerful server.

With ESX Advanced features like VMotion, SVMotion and VDR, you can even have a second "hot standby" physical server to which your virtual servers can fail over to, in real time, in the event of primary server failure. Best of all, this failover occurs while users continue to work, and there is zero down time! When the primary server is repaired, you can simply put it back in to production, and fail all of the virtual servers back to the primary hardware!