I take it this is a paper copy only? For that you will need OCR software to
convert the scan into editable text. Office includes Microsoft Office
Document Imaging (which may not have been installed) which is a rudimentary
OCR solution.

Signature
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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> I have a document /cover letter that I wrote several years ago , I am
> on windows vista (ameteur) and i am trying to change the date
> without writing the whole letter over. please help.