What version of Acrobat are you using?
When you say "back", do you mean that it was there previously? Or do you
mean "back" as in "the way it was in Word 2003"?
Word 2007 doesn't normally have a menu at all, so it's not clear what you
mean--the menu was replaced by the ribbon. Some older versions of the
Acrobat toolbar can show up in the Add-ins tab in Word 2007, with limited to
no functionality. I don't know about integration in more recent versions of
Acrobat, since Microsoft's free add-in has basically made Acrobat a moot
issue for me.
If this is for creating .pdf files, you might find the free add-in from
Microsoft fills your needs without having to resort to using Acrobat. It can
be downloaded here:
http://www.microsoft.com/downloads/...11-3E7E-4AE6-B059-A2E79ED87041&displaylang=en