In the official IEBlog , describing the capabilities of the recently released IE10 PP2, there was news saying that IE10 will not support Conditional Comments for compatibility with the new HTML5 parser.
Removing legacy features
If you’re not compatible with HTML5 parsing, we’ve removed it.Sites that rely on these legacy features.This way, we’ll not be able to work with IE10 even today. ')
Instead, developers are encouraged not to clarify the browser model, but to determine its capabilities .