JoAnn,
The retail copies of MS Office 2007 and the trial versions of Office 2007 are identical.
For folks who attended a Microsoft Office 2007 launch event and were given complimentary copies of MS Office, the procedure is to
download the trial and use the retail product key provided.
What is the issue are you trying to avoid?
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I strongly recommend you uninstall any trial versions before installing a
full version. This can avoid issues down the road.
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JoAnn Paules >>
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Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*