I think I posted this question several years ago in regards to pop and imap and using google app mail. In the end, I used POP because it was a hell of a lot more responsive. However, I'm revisiting this question because one of the individuals is telecommuting. The email from the home office is stealing mailing when she comes into the main office.
I opted to try imap on outlook again and it's still remains clunky. Anyway, the most important is all new email unless deleted must be accessible from all outlooks or phone email. Please let me know your experience and recommendations.