60 days
to move nearly 100,000 mailboxes
No disruption
to global mail flow during the move
20 tickets
in total after cutover

The challenge

A global medical technology company protected its email with a third-party secure email gateway. The gateway added renewal cost and operational complexity, and it kept email threats in a separate console from the rest of the company’s Microsoft 365 security, so the Deputy CISO’s team couldn’t see everything in one place.

What we did

  • Mapped every gateway control to its equivalent in Microsoft Defender for Office 365, or to a stronger one.
  • Rebuilt email authentication and routing (SPF, DKIM, DMARC, DNS and MX records) across about 100 email domains.
  • Deployed Defender for Office 365 and moved mail in phases, with a rollback plan at every step.

What’s next

Email protection now sits alongside the rest of the company’s Microsoft 365 security in Microsoft Defender, and the team is looking at Microsoft Sentinel as the next step.

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