An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
"Outlook for Mac uses separate profiles for Legacy and New versions. When switching between them—like after a restart—emails and folders may not appear if they belong to a different profile. To locate missing emails, check this folder: ~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/. Also, try logging into Outlook Web to see if your emails are still on the server."