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Business Premium vs Microsoft 365 E3

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Business Premium vs Microsoft 365 E3

Business Premium vs Microsoft 365 E3: Premium wins on security for less money, E3 wins on mailboxes, Windows, and scale. How to choose, and how to mix them.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/microsoft-365-business-premium-vs-e3

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01

Is Microsoft 365 E3 more secure than Business Premium?

No — the reverse. Business Premium includes Microsoft Defender for Business (real EDR) and Defender for Office 365 Plan 1; E3 includes neither. An E3 tenant has baseline Exchange Online Protection for email and Defender…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/microsoft-365-business-premium-vs-e3

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02

Can I mix Business Premium and E3 in the same tenant?

Yes. The 300-seat cap applies per SKU, not per tenant. A 450-person organisation can run 300 users on Business Premium and 150 on E3, or put knowledge workers on Business Premium and frontline staff on F-plans. Nothing…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/microsoft-365-business-premium-vs-e3

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03

What does E3 actually add over Business Premium?

Capacity and compliance, not security: 100 GB mailboxes instead of 50 GB, Windows 10/11 Enterprise, deeper Purview tooling (eDiscovery Standard and broader retention and DLP scope), and no seat cap. The identity and dev…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/microsoft-365-business-premium-vs-e3

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04

What happens to our security if we migrate from Business Premium to E3?

You lose Defender for Business and Defender for Office 365 Plan 1, and E3 replaces them with nothing. Close the gap explicitly as part of the migration — an E5 Security add-on, standalone Defender plans, or a third-part…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/microsoft-365-business-premium-vs-e3

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