This is the message from Microsoft
"Support for Office 2010 Service Pack 1 ended on Oct. 14, 2014. But with Service Pack 2 installed, you'll find this version still has a long extended support period ahead, with end-of-support dates that are nine months after those of Windows 7.
Mainstream support ends: No longer supported
Extended support ends: Oct. 13, 2020."
If you are using Windows 10 you can stop the notifications