The question title pretty much says it all but what appears to be an international standard as of today is TLS 1.2 and I noticed many users not able to connect to the site now that we switched. I am assuming it could be because there browser may not support TLS 1.2 so I'm asking do you know what browsers do support TLS 1.2 and which Internet browsers don't support TLS 1.2?

TLS 1.1 and 1.2 not supported:

Internet Explorer (6-8 for Windows Server 2003, 7–9 for Windows Vista / Server 2008), Safari 6 for Mac OS X 10.8

TLS 1.1 and 1.2 supported, but disabled by default:

Internet Explorer (8–10 for Windows 7 / Server 2008 R2, 10 for Windows 8 / Server 2012, IE Mobile 10 for Windows Phone 8)

To enable TLS...

Click the gear/tools

Go into Internet Options, then on Advanced tab check the box for TLS1.2.

Check Out Wikipedia for more info