On the Page Layout tab of the ribbon, click the Page Setup dialog
launcher (the tiny button in the lower right corner of the Page Setup
group). In the dialog, click the Layout tab and check the option for
Different First Page. Click OK.
This gives you two different headers, one for the first page and
another for all other pages.
Go to the Insert tab of the ribbon, click the Header button, and
either choose one of the headers in the gallery or choose Edit Header
from the bottom of the gallery. The text and/or cursor will appear in
the header area, which is tagged with "First Page Header". Anything
you put there will appear only on page 1.
See
http://sbarnhill.mvps.org/WordFAQs/Letterhead.htm for some advice
about letterhead construction.
--
Regards,
Jay Freedman
Microsoft Word MVP
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