414,877 companies use Microsoft 365, as of October 2026.
Microsoft 365: Email, Office and Teams. We've found 414,877 companies using Microsoft 365, most often in IT Services (17%) and Financial Services (8%), typically with 11–50 employees and 34% based in United States.
Customers414,877companies use it
Most popular withPrimary/secondary Education24× more likely than average
Typical customer11–50employees · mostly United States
We've found 414,877 companies using Microsoft 365 among the 302,432 we've scanned so far. We only count a company when a direct public record backs it up.
What kind of companies use Microsoft 365?
Microsoft 365 customers are most often in IT Services (17%), Financial Services (8%) and Software (8%). The most common company size is 11–50 employees (56% of customers with a known size).
Which countries use Microsoft 365 the most?
Most Microsoft 365 customers we've found are in United States (34%), United Kingdom (9%) and Germany (9%).
What are the alternatives to Microsoft 365?
The most used alternatives in the same category are Google Workspace (251,167 companies), Apple Business (58,955 companies), Exclaimer (15,945 companies) and Tencent Exmail (3,889 companies).
Have companies stopped using Microsoft 365?
Yes: 1 company no longer show Microsoft 365 on a rescan done the same way as the scan before. See the "Dropped it" tab.
How does runsonwhat know a company uses Microsoft 365?
We read public traces only. For Microsoft 365 that means a domain-verification record in the company's DNS, the company's email records (SPF, MX, DKIM), a subdomain that points at Microsoft 365 and the company's published subprocessor list. Every match keeps the record it came from.