We’re working on the ability to share a file or folder with a specific Microsoft Account.Anonymous commented
It is absolutely unacceptable for Microsoft to not have this as an option. I understand not wanting to confuse casual users, so why not have "basic sharing" enabled by default on new accounts. Advanced users can enabled "advanced sharing" in the O365 control panel if they want/need this feature. That allows casual users to have an easy experience and advanced users the ability to enable features that they need.