I've restored all the comments that vanished after I removed Disqus last weekend. This is after a considerable effort to get everything out of BlogML and into WXR a couple of years ago. At some point I'll just have to give up and decide it's faster to write my own blogging and commenting system but for now Facebook Comments are enabled for all posts.
I’ve just moved ITHCWY comments over to Disqus. BlogEngine.NET now supports Disqus out of the box, but doesn’t export comments to anything that Disqus is willing to eat. I’ve knocked up a quick converter that takes a full BlogML export from BlogEngine.NET (and at least in theory any other source of BlogML) and converts the comments to WXR. You can import the WXR file under the Generic option in Disqus.
The tool is a Windows console application that takes two parameters, the BlogML import file and the WXR output, i.e.:
BlogMLtoDisqus.exe C:\BlogML.xml C:\ForDisqus.wxr
It isn’t fancy and there is no error checking so it will either work or die horribly. If the latter, leave a comment and I’ll try to fix it for you.
Updated 2011-04-22: Added an optional third parameter that specifies the XML namespace for BlogML in case you need to override the default.