No, but for large windows installations based on active directory it's the only one they can easily manage. Other browsers need to provide an MSI installer to make it easy, though after 5.5 years of asking, Firefox still doesn't have one:
And before you say but it has to have proper support, yadda-yadda. They're an MS Certified Partner and an established company based in Pennsylvania - if the MSI is messed up you should be able to sue them for losses or pay them for support.
I've never used nor do I have connection with this company - caveat emptor.
