Some bugs are frightening while others are just plain funny. If you happen to rely on Outlook Express and are intending to install Office 2007 anytime soon, you may want to be aware of a spellcheck bug that plagues OE users. In particular, installing Office 2007 results in Outlook Express 6 being unable to spellcheck in any language except French afterwards, due to the installer removing older files.
Microsoft doesn't have an estimate on a fix, even though the problem apparently began rearing its head some months ago. You can read more about it in Microsoft's knowledge base.