Updated: March 11, 2025 (March 11, 2025)

Legacy Outlook for Mac Phaseout Starts Oct. 2025

As managing vice president, Rob Helm covers Microsoft collaboration and content management. His 25-plus years of experience analyzing Microsoft’s technology... more

Customers should migrate their Macs off legacy Outlook as soon as possible if they access Exchange Online or get Outlook for Mac through Microsoft 365.

Not affected: Macs that get Outlook through Office LTSC and don’t use Exchange Online.

Legacy Outlook for Mac will stop working for some Microsoft 365 users in Oct. 2025, and for more in Oct. 2026. Losing legacy Outlook will disrupt work for these pockets of Mac users, who might need special attention from IT.

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