Defaults.Exposed › Stats › Email authentication (SPF, DKIM, DMARC)
How many domains use Microsoft 365 for email?
As of July 28, 2026 · census snapshot 2026-07-28
As of July 28, 2026, 14,051,037 domains route their email through Microsoft 365 — 8.61% of the 163.2 million domains with MX records in the Defaults.Exposed census.
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Statistic current as of July 28, 2026. Recomputed from the live census each edition; the number on this page and the machine-readable twin always match. Please cite Defaults.Exposed and link this page.
Defaults.Exposed, "How many domains use Microsoft 365 for email?" (as of July 28, 2026). https://defaults.exposed/stats/how-many-domains-use-microsoft-365-for-email
Permalink:https://defaults.exposed/stats/how-many-domains-use-microsoft-365-for-email · Machine-readable:microsoft-365-share.json · Licence:open data
Methodology: how we grade the internet · Source data: defaults.exposed/data. Updated with each census edition.