Forensic collections of O365 mailboxes

As the title suggest, what are people using/doing to collect O365 mailboxes that is not using the Microsoft Compliance eDiscovey portal.

aka Nuix Workstation (GraphAPI), MailStore Client, so on so forth.

Any information on pro's and con's for the method you use and any possible hiccups you have found during the course of using these apps.

computerforensics forensic o365