The most used email and workspace providers
We track 21 email and workspace providers. The most used is Microsoft 365, found at 693,205 companies as of October 2026, ahead of Google Workspace (392,652) and Apple Business (109,207).
Almost every company with its own domain runs its mailboxes on Google Workspace or Microsoft 365. Microsoft leads at larger and older companies; Google Workspace leads at startups and smaller firms. Privacy-focused providers (Proton Mail, Fastmail, Tuta) and regional ones (Tencent Exmail, VK WorkSpace) make up most of the rest.
Email and workspace providers ranked by companies using them
“Share” is each tool's part of all 1,266,014 matches in this category; a company that uses two tools counts for both.
| # | Tool | Companies | Share | Last 30 days | Most popular with |
|---|---|---|---|---|---|
| 1 | 693,205 | 55% | +79−14 | 1,001–5,000 employees (1.4×) | |
| 2 | 392,652 | 31% | +47−5 | Internet (1.6×) | |
| 3 | 109,207 | 8.6% | +72−14 | 1,001–5,000 employees (3.0×) | |
| 4 | 34,356 | 2.7% | +714−1 | Construction (2.7×) | |
| 5 | 6,387 | 0.50% | +39 | Electrical/electronic Manufacturing (5.3×) | |
| 6 | 6,088 | 0.48% | +26 | Restaurants (3.6×) | |
| 7 | 5,921 | 0.47% | +44 | Internet (2.4×) | |
| 8 | 4,620 | 0.36% | +13 | Marketing and Advertising (2.0×) | |
| 9 | 3,183 | 0.25% | +20 | Electrical/electronic Manufacturing (8.3×) | |
| 10 | 2,412 | 0.19% | +2 | 1–10 employees (3.1×) | |
| 11 | 1,912 | 0.15% | – | Restaurants (3.4×) | |
| 12 | 1,686 | 0.13% | +30 | Internet (2.0×) | |
| 13 | 1,094 | <0.1% | +3 | 1–10 employees (5.5×) | |
| 14 | 992 | <0.1% | +30 | Construction (3.7×) | |
| 15 | 901 | <0.1% | +74 | 1–10 employees (2.4×) | |
| 16 | 398 | <0.1% | +14 | IT Services (2.1×) | |
| 17 | 382 | <0.1% | +9 | Software (2.0×) | |
| 18 | 295 | <0.1% | +16 | Retail (2.4×) | |
| 19 | 223 | <0.1% | +40 | IT Services (1.9×) | |
| 20 | 53 | <0.1% | +2 | – | |
| 21 | 47 | <0.1% | – | – |
“Most popular with” is the industry or company size where the tool is most over-represented compared with all companies we've scanned. Starts and stops compare two scans done the same way.
Who's gaining and losing customers
- Exclaimer: 714 started, 1 stopped in the last 30 days
- iCloud Mail: 74 started in the last 30 days
- Microsoft 365: 79 started, 14 stopped in the last 30 days
- Apple Business: 72 started, 14 stopped in the last 30 days
- Yandex 360: 44 started in the last 30 days
- Google Workspace: 47 started, 5 stopped in the last 30 days
How to compare email and workspace providers
- The office suite your team already uses (Docs and Sheets, or Word and Excel).
- Identity: Microsoft Entra ID or Google accounts as the company directory.
- Security and compliance add-ons included in each plan.
- Price per user at the tier that includes the features you need.
How we find email and workspace providers
The mail provider is named directly by a domain's MX records, and confirmed by SPF includes, DKIM keys and verification TXT records.
Every company on a tool's page links to the record behind the match. DNS is rechecked weekly and websites monthly, so tools a company stops using drop off the list.
Workspace FAQ
What are the most popular email and workspace providers?
As of October 2026, the most popular email and workspace providers by number of companies using them are Microsoft 365 (693,205 companies), Google Workspace (392,652 companies) and Apple Business (109,207 companies), according to runsonwhat. Microsoft 365 alone accounts for 55% of the 1,266,014 Workspace matches runsonwhat has, and the top three together for 94%. 21 email and workspace providers have at least one confirmed customer.
Microsoft 365 vs Google Workspace: which is more popular?
Microsoft 365 is more popular: 693,205 companies show public evidence of Microsoft 365, against 392,652 for Google Workspace (1.8× as many), according to runsonwhat (October 2026). Apple Business is third with 109,207.
Which email and workspace providers do small businesses use most?
Among companies with up to 50 employees, the most used email and workspace providers are Microsoft 365 (341,884 companies), Google Workspace (236,427 companies) and Apple Business (31,481 companies), according to runsonwhat (October 2026). The counts cover companies with a known headcount; see each tool's page for the full size breakdown.
Which email and workspace providers do large companies use most?
Among companies with more than 1,000 employees, the most used email and workspace providers are Microsoft 365 (34,832 companies), Apple Business (11,117 companies) and Google Workspace (9,659 companies), according to runsonwhat (October 2026). Large companies often run more than one tool in a category, so the same company can count for several.
Which email and workspace providers are most popular in the United States?
In the United States, the most used email and workspace providers are Microsoft 365 (213,405 companies), Google Workspace (127,557 companies) and Apple Business (42,764 companies), based on companies runsonwhat has located there (October 2026). Microsoft 365 has 53% of the Workspace matches among companies based in the United States.
Which email and workspace providers are most popular in the United Kingdom?
In the United Kingdom, the most used email and workspace providers are Microsoft 365 (54,374 companies), Google Workspace (16,690 companies) and Apple Business (8,537 companies), based on companies runsonwhat has located there (October 2026). Microsoft 365 has 63% of the Workspace matches among companies based in the United Kingdom.
Which email and workspace providers do IT services companies use?
IT services is the industry with the most Workspace matches, and its companies use Microsoft 365 (61,157 companies), Google Workspace (35,353 companies) and Apple Business (7,866 companies) most, according to runsonwhat (October 2026). Each tool's page breaks its customers down by industry, so you can check where a tool over-indexes.
Which email and workspace providers are companies adopting right now?
In the 30 days to October 2026, the most new adoptions runsonwhat recorded were for Exclaimer (714 companies), Microsoft 365 (79 companies) and iCloud Mail (74 companies). A start is counted when a recheck finds a tool that the previous check of the same company, done the same way, did not.
How does runsonwhat rank email and workspace providers?
runsonwhat counts the companies where a public record shows each tool in use and ranks by that count. The mail provider is named directly by a domain's MX records, and confirmed by SPF includes, DKIM keys and verification TXT records. A company counts only when a direct record backs it up. The full method is at https://www.runsonwhat.com/methodology.