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With ies4linux installed IE 6 -- shows the map, controls are available.
What does not
Crashes in some special cases (will be better specified later).
What was not tested
Don't know yet :-)
Our stupid Ministery of Agriculture provides a web application (http://farmar.mze.cz) obligatory to use for all bigger farmers in the Czech Republic without support of any other OS than Win (>=98) and other browser than IE (>=6) with ActiveX. Java and Mozilla versions don't work in this case.
I'm -- this time -- not sure, if the problem specified is in Internet Explorer, MapGuide Viewer, or elsewhere, but I'll inform you :-)