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There is evidence that IE10 with IE5 quirks enabled works in most cases except when using some of the administrative functions
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Bills on the Web - OnBase
“Bills on the Web” utilizes a docpop from MySlice to the OnBase application. As such, browser limitations are based on this technology and the OnBase application. The OnBase application that we are running is v11 and we plan to upgrade to v13 in late September 2013.
Windows operating systems
Windows 7 64-bit (32-bit), and Vista
FF 22, FF 7, FF 3.6
IE 9, 8
Windows XP
FF22, FF 7, 3.6
IE 8, 7
Apple operating systems
OSX 10.8 - OSX 10.8
Safari 6
FF3.6
What SU testing has shown
Current Java plugin required
Windows 7 64-bit (32-bit)
FF 22, FF 7 does work
Windows XP
FF22, FF 7 does work
Windows 8 with IE10 does not work
Windows 8 with FF18, FF22 does not work