If I create a group with 100 or more email addresses in it, what is the likelihood of the email ending up in the recipient's "Junk" or "Spam" folder?

If you put the group in the 'BCC' section of the message rather that the 'To' section (and your ISP will allow you to send to 100+ addresses without treating the message as spam) then the individual recipients will only see their own address on the message, so it will not be treated as spam, for that reason alone, by the recipients.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com

Thank you so much...