What version of Word are you using, and exactly how are you going about
trying to select a different list?

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Hope this helps.
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Doug Robbins - Word MVP
>I am trying to create envelopes using the mail merge in Word and a
> spreadsheet in Excel. I try to select a different list and it won't work.
> An old list keeps coming up. I can't find any way to get the new list
> accepted.