The following list is a community-driven list of key products covered on the TechNet Wiki and the top associated articles. This list is not intended to include all the articles about each product.
.NET Framework
Active Directory
BizTalk Server
Enterprise Library
Exchange Server
Forefront
Hyper-V
PowerPivot
SharePoint Server
Solution Accelerators
SQL Azure
SQL Server
SQL Server Express
SQL Server Management Studio
Sync Framework
System Center Configuration Manager (SCCM)
System Center Operations Manager (SCOM)
Windows 7
Windows Azure
Windows Communication Foundation
Windows Embedded Compact Test Kit (CTK)
Windows PowerShell
Windows Root Certificate Program
Windows Server
Windows Server AppFabric
Windows Server Security API
Windows Workflow Foundation