That suggests you've done some kind of mailmerge, with the result that you have many copies of some content. Naturally, depending on what that content is and how many records you merged, you could end up with a very large file. The size of the Excel file isn't particularly relevant in this case, though a 250Mb file size suggests you might have merged some thousands or records into a single Word document.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]