I've had this happen to me too. I'm not sure why it disappeared but
this macro should get it back for you.

To use it, copy/paste the following macro, and in Word press <Alt F11>
to open the VB Editor. If there isn't a module displayed then use
Insert/Module and paste the macro. Make sure you have a document open,
place your cursor within the code and press <F5> to run the macro. The
Header and Footer toolbar should return. Note that this macro doesn't
need to be saved, it only needs to be ran once.

Sub ResetToolbar()
ActiveWindow.ActivePane.View.SeekView = wdSeekCurrentPageHeader
With CommandBars("Header And Footer")
  .Protection = msoBarNoChangeVisible
 .Reset
 .Enabled = True
 .Visible = True
End With
End Sub

Beth Melton
Microsoft Office MVP

If Beth's solution does not work, you've probably moved the toolbar off the
screen. Open a document and go into Header / Footer view. If the toolbar
does not display then press Alt-F11. This brings up the vba editor. At the
bottom of the screen should be a window that says "Immediate Window." If it
is not, press Ctrl-G.

Type the following in the Immediate Window and press Enter:

Application.CommandBars("Header and Footer").Visible = True

Go back to the Word window. Can you see your toolbar? If not then go back to
the Immediate Window and add the following two statements:

Application.CommandBars("Header and Footer").Top = 394
Application.CommandBars("Header and Footer").Left = 152

Note, you can cut and paste the statements from this message into the
Immediate Window but have to paste them one at a time and press Enter at the
end of each statement yourself. You can close the vba Editor. Your toolbar
should be there and should stick around for you next time you open Word's
header/footer view.

Hope this helps.

See http://www.gmayor.com/MSNews.htm and
http://word.mvps.org/FindHelp/Posting.htm.