This is a posting written in Word 2007 (which I have installed in an effort to fulfil the requirements of an "expert user" at the University). I noticed you could create a blog posting if you make a new document. Turns out that you are asked to register your blog, and away you go, hopefully. Don't know what happens if you have more than one (as I haven't).
Realised when viewing this that it had no title - have just added one in Blogger. Don't yet know how to do it from Word.