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Microsoft 365 among SaaS companies
Microsoft 365 was detected on 1,773 of 8,173 crawled SaaS company websites, a share of 21.7%.
Read from each domain's MX record, and for domains behind an email gateway from its SPF record, not from the homepage.
| Group | Crawled | Running Microsoft 365 | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,888 | 2,258 | 46.2% |
| Y Combinator companies | 5,386 | 279 | 5.2% |
| Fortune 500 | 472 | 171 | 36.2% |
| Unicorns | 1,000 | 199 | 19.9% |
| SaaS companies | 8,173 | 1,773 | 21.7% |
| Tranco top 10,000 | 1,572 | 260 | 16.5% |
8,173 of the 9,008 SaaS domains fetched so far returned a usable record and form the denominator. 56 were counted from a rendered homepage crawl on 4 September 2026, 8,117 from a plain fetch only, and 835 returned no usable record. The list holds 55,839 domains; the rest have not been crawled yet. Company list: list of SaaS company domains. <5 means fewer than 5 crawled domains in that group. Rank 2 of the 5 Email Hosting tools published for this group.
Software used by SaaS companies · Email Hosting across all groups
By state
| State | Crawled | Running Microsoft 365 | Share |
|---|---|---|---|
| California | 521 | 70 | 13.4% |
| New York | 129 | 24 | 18.6% |
Source: Installmap crawl, 4 September 2026
Badge
<a href="https://installmap.com/groups/saas/microsoft-365"><img src="https://installmap.com/badges/saas/microsoft-365.svg" alt="Microsoft 365 runs on 1,773 of 8,173 crawled SaaS companies (21.7%)"></a>
[](https://installmap.com/groups/saas/microsoft-365)
Badge URL: https://installmap.com/badges/saas/microsoft-365.svg · all badges.
Cite this
Installmap, Microsoft 365 among SaaS companies, crawl of 4 September 2026, https://installmap.com/groups/saas/microsoft-365.
Other Email Hosting tools in this group
- Google Workspace 59.3%
- Zoho Mail 1.3%
- Rackspace Email 0.3%
- GoDaddy Email 0.1%
- IONOS Mail 0.1%