A breakdown of the 1.8K+ companies running Microsoft ESMTP.
Top industries
Information technology and services363
Professional and business services217
Industrial and manufacturing169
Education and training141
Construction and building135
Financial services103
Media and telecommunications100
Art, sports and recreation96
No industry recorded: 184
Company size
1–10214 (15%)
11–50346 (25%)
51–250391 (28%)
251–500168 (12%)
501–1,00090 (6%)
1,001–5,000125 (9%)
5,001–10,00026 (2%)
10,001+33 (2%)
Share of companies with a recorded size, by employees.
No size recorded: 499
Versions detected
10 versions across the confirmed companies. Counts are distinct companies seen running that version.
10.0.17763.1697277
10.0.14393.4169166
8.5.9600.16384143
10.0.20348.1106
6.0.3790.467577
7.5.7601.1751473
8.0.9200.1638434
7.0.6002.1826415
6.0.3790.395913
10.0.14393.010
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Frequently asked questions
About the Microsoft ESMTP data on this page.
How many companies use Microsoft ESMTP?
Firmable holds confirmed Microsoft ESMTP detections for 1,892 distinct companies, 1,892 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Microsoft ESMTP?
Affinitiv, Hawaii Health Systems Corporation and Crossroads Cars are among the most prominent in the current set.
What industries use Microsoft ESMTP?
Information technology and services, professional and business services and industrial and manufacturing lead the set, across 19 industries in total.
What size companies use Microsoft ESMTP?
Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.
Where are Microsoft ESMTP users based?
The United States, Australia, Canada and the Philippines account for most detections, across 13 countries.
How current is this data?
1,892 companies were confirmed in the last 90 days. Last detection 14 October 2026.
