I received a task to create 1,745 shared mailboxes inside Office 365 Exchange Online. I received the mailbox name, the user information, and the access rights. What is the quickest way to get this done via Powershell? Do anyone have a script that allows for bulk upload to Exchange Online? Step by Step guidance will be helpful as well. I've already searched online and couldn't locate an up to date guidance on how to tackle this task.