If you have the mailmerge main document open, Word opens the source file in the background and you can't open it for editing. However (in Word 2010, at least) the mailings tab on the Ribbon has an 'Edit Recipients List' function that allows you to choose which recipients get included and even to edit the source file by adding/deleting records. Alternatively, close the mailmerge main document, then open the source file.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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