Go to Start > Run and type winver in the command window. Click on
Microsoft Software License Terms, then scroll down to Section 3e. For Windows 7 Home Premium your allowed up to 20 simultaneous connections for file/print sharing, IIS, ICS and telephoney services.
Now when you say inbound connections are you talking about a VPN? AFAIK the limit on inbound connections to the native PPTP VPN server is still one.
MS-MVP Windows Expert - Consumer "When all else fails read the instructions"