1: It doesn't matter what Mail program you are using (It only use the SMTP server).
2: It doesn't matter what Office version you are using (97…2016)
3: You can send a range/sheet in the body of the mail (some mail programs can’t do this)
4: You can send any file you like (Word, PDF, PowerPoint, TXT files,….)
5: No Security warnings, really great if you are sending a lot of mail in a loop.