Q. Is it true that Windows 7 allows 20 concurrent connections instead of 10?

A. Yes. 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.