Internet Explorer Mobile is not in the supported browser list.
That doesn't necesserily mean it won't work at all, but some features
might not.
The problem (as I have experienced it) is that the OS captures user
actions and applies them to the entire page. It doesn't pass
pinch-to-zoom or pans through to the map. Clicks (touches) are ok on
the map. But without being able to pan it's a bit limited.