I want to preface by stating I have Googled the living you know what out of this issue and have not had any success following the suggestions, workarounds, etc. that I have found.
I have a client with 45 users on Office 365. One user, a manager, has a sub-folder in his Outlook inbox labeled Action Items that he would like to share out with two of his assistants. I have added the users as suggested to both the top level account name and specific folder needing to be shared, but I haven't been successful. Can anyone shed light on this feature and what I am missing or know of a detailed step-by-step article that shows how it's done?