Note: Windows XP and Windows Vista always has TCP/IP installed, so you don't need to check this if you are running Windows XP and Vista.
See Also
How to block all incoming external IP addresses on Windows Server 2019? - Microsoft Q&AHow to disable Simple TCP/IP ServicesAllow traffic in fixed TCP/IP portsEnable Named Pipes and TCP/IP ConnectionsTo check if your computer has TCP/IP installed you can do the following:
- Select the Windows Start button, then the Settings menu, and then the Control Panel from the Settings menu.
- Double click on the Network icon.
- Look in the top list box in the Configuration tab.
- If you do not see an entry that starts with TCP/IP then you have not installed TCP/IP. You can install it using the How to add TCP/IP instructions.
If TCP/IP is installed on your computer and you still cannot see anybody in your Office Messenger "To:" list, then it might be the case that you have a personal firewall installed on your computer. You need to make sure that the firewall has been configured so that the following ports are available for Office Messenger to use:
UDP port number (streamed port): 2230
TCP/IP port number (datagram port): 2240
