Trying to mail merge in Word for envelope addressing.  
In Word, Tools, Letters&Mailing, Mail Merge.  Mail Merge window pane appears
on right. Select "envelopes" as document type and then Next.  Using Current
blank document.  Problem arrises next, when "Selecting Recipients".  I click
on browse and select my excel file.  Then comes a "Select Table" dialog box.  
I find the Sheet in the workbook that I want and select it.  Then it takes me
to antother Select Table dialog box, only this one is empty.  When I hit OK,
it says "Word was unable to open the data source".  That is NOT what is
described in teh help files.  Why wont it open my excel workbook and use
those addresses for these mail merge envelopes????