Microsoft 365
Microsoft 365 in each crawled group, and in the wider sample. Email Hosting.
| Group | Crawled | Running Microsoft 365 | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,888 | 2,258 | 46.2% |
| Y Combinator companies | 5,388 | 279 | 5.2% |
| Fortune 500 | 472 | 171 | 36.2% |
| Unicorns | 1,000 | 199 | 19.9% |
| SaaS companies | 8,048 | 1,740 | 21.6% |
| Tranco top 10,000 | 1,572 | 260 | 16.5% |
| Wider sample | 8,291 | n/a | n/a |
Group rows come from rendered homepage crawls; the wider sample is a plain fetch, so it undercounts tools a tag manager injects after the page loads. <5 means fewer than 5 crawled domains in that group. Method · Email Hosting across all groups · Microsoft 365 Exchange Online mail, from its protection.outlook.com MX host, or its SPF include behind a gateway.
Cite this
Installmap, Microsoft 365 adoption, crawl of 2026-09-03, https://installmap.com/tools/microsoft-365.