Administrators can use PowerShell to create, enable, disable, or delete rules in user's mailboxes.
Use PowerShell to set up Automatic replies (out of office) . Check or change the dates, change the message, enable ot disable automatic replies.
How to migrate email to a new Office 365 or Outlook.com account, or to an IMAP account.
Microsoft implemented stricter fraud detection checks in Office 365 and Exchange Online Protection and unauthenticated messages are automatically marked as spam and moved to the Junk Email folder.
Use the Remove-CalendarEvents cmdlet to cancel and remove calendar events organized by a former employee.
How to Copy events to other calendars using Copy to My Calendar, a macro, or Microsoft Flow.
Can you create an appointment or meeting using contents of an email message in Outlook on the web?
PST Collection Tool from Microsoft is the successor to the PST Capture tool. In addition to helping administrators collect PST files in their network, it can also lock down their usage.
What to check when the Focused Inbox is enabled for the account but isn't available in Outlook.
A new feature in Office Groups (available in Office 365 Exchange Online) is the ability to use 'Send as' or 'Send on behalf of', just as you can for shared mailboxes.