Not sure how you could possible do that from Outlook.
Are all the attachments of a single file type? If not, then you on a
complete non-starter in my opinion.
If they are all one file type, what is it? You could append multiple
TIF image files, or PDF files, but how would you put, say, multiple
excel workbooks into a single file?
Perhaps you mean zip them up into a single archive file?
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