Did you know that Office Groove 2007 has Spell Check?
Although it may seem hidden, you can use Spell Check during many of your Groove activities. All you need to do is press F7 on your keyboard and Spelling will pop up! Try it when creating an Instant Message to a colleague, adding a discussion item, creating a note in the notepad, any place where you can enter in Rich Text. It is that easy.
link to this article: http://blogs.technet.com/groove/archive/2007/12/14/did-you-know-groove-2007-has-spell-check.aspx