There is no limit on the number of mergefields as far as the mail merge main
document is concerned. What limits there are, are imposed by the data
source. In the case of Excel, you are limited by the maximum number of
columns A to IV which I believe comes to 256.

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Hope this helps.
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Doug Robbins - Word MVP
>I have a user that is trying to convert a mailmerge form word perfect &
>lotus
[quoted text clipped - 4 lines]
> allows
> more than 60.