According to the xMatters 5.1 documentation:
Web Browsers
xMatters supports Microsoft Internet Explorer 7 and 8, Mozilla Firefox 3 and higher, and Google Chrome 13 and higher.
Note: xMatters can be used with Internet Explorer 8 running in compatibility mode. To use this mode, navigate to
Tools > Compatibility View Settings and add the URL for your xMatters deployment (or select the Display all
websites in Compatibility View check box).
IE8 was released about 5 years ago, are there plans to support IE10 and/or IE11?
Right now my company is still using IE8, but our folks responsible for our web browser standard are investigating what applications can support higher versions.
Appears IE8 is still the most common IE version out there, at least it was last August according to this article:
http://goo.gl/Pz22Qw Although IE10 right behind it though.