On a computer that's running Windows 7 (x64 in my case) with Internet Explorer 10, when you click "Open with Explorer" in Microsoft SharePoint 2010, you receive the following error message: "Your client does not support opening this list with Windows Explorer."
The website in question has been added to the IE10 Trusted Sites list.
The server is configured properly in that this functionality works in IE9 and below on Windows 7 and for IE10 on Windows 8. (I've not yet applied the June 2013 cumulative update for SharePoint, however. But I'd really like to see an IE10 patch in that we need to access document libraries in other SharePoint 2010 servers that we do not manage.)
According to http://support.microsoft.com/kb/2835527/en-us this is also a known problem for SharePoint Online and per that KB article, "Microsoft is working to resolve the issue." However, that KB article was published a number of months ago.
Has this issue been resolved? If not, is there a hotfix that can be applied to IE10 pending a service pack release? And, what is the timeline for the fix?