This article shows the steps that can be used to block and unblock senders in Outlook Web App (OWA).
Change "Reply All" to "Reply" by default in OWA
Instructions for enabling and downloading FindTime extension in Outlook.
Resolve Outlook Issues where end users are reporting:
Missing shared calendar events.
• Moved shared calendar events reverting back to where they original we scheduled for.
• Deleted shared calendar event reappear randomly within the calendar.
• Duplicate calendar events appearing in the shared calendar.
Solution: Solution adjust the cached/uncached mode of the end users Microsoft Outlook Calendars.
Guide for releasing emails from Exchange Online Protection quarantine