Premium Outlook was a separate premium paid version of Outlook. Microsoft canceled Premium Outlook in late 2017. However, it did add premium capabilities to the Outlook desktop client that is included with Microsoft 365.
Outlook with premium features is included with every Microsoft 365 Home or Microsoft 365 Personal software subscription. The advantages of Outlook for Microsoft 365 include:
Each user is assigned a 1TB storage mailbox.
Malware detection is now more effective.
Ad-free inbox.
Ability to compose emails offline and sync them automatically.
Custom domain-name for better user-experience.
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