Another change in the latest version of Windows another compelling reason to upgrade I just found out is:
Windows 7 allows 20 concurrent connections instead of 10, which is a change from prior versions of Windows(non-server).
Previous versions of Windows limited you to five connections if you were running Home Basic or 10 connections for Home Premium or higher editions. With Windows 7, all editions support 20 concurrent connections for services such as File Services, Print Services, IIS, Internet Connection Sharing, and Telephony.
If you want to confirm this, just run the winver command, click the Microsoft Software License Terms link, then scroll down to section 3F, as shown here.