Probably WLM won't solve this problem but If I were you, I'd move over to
WLM in any regard. I Think you'd like it better and is considered a
replacement for WM. It's really painless to update and almost everything
come up automatically. Take a look here.
http://get.live.com/wlmail/overview
Now as far as Your Word 2007 and as Gordon was trying to say, This is a
common question and can be found easily by using Google. But a synopsis is:
1. 2007, to be read in a previous version needs to be saved (by you) in the
down-revision format for them to read. You might notice the 2007 extension
is .docx and what the other end is looking for is .doc. 2. Make sure the
people at the other end allow attachments to pass. 3. We are assuming here,
nothing else has changed. If these thing don't work and you still have
problems, please come back and ask again (or Google more, that's really
what we do a lot)