Microsoft 365 vs RoundCube
Head-to-head usage across the sites we track.
Top sites by authority
Microsoft 365 · RoundCube · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Microsoft 365 · RoundCube · share of sites in each country using one or the other
United States
513,561
917
United Kingdom
192,504
583
Germany
149,868
827
Canada
123,911
313
India
114,600
690
Netherlands
111,248
525
France
109,542
597
Australia
104,165
201
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Microsoft 365 | RoundCube |
|---|---|---|
| LCP | 1.8 s | 1.5 s |
| INP | 50 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 600 ms |
Median site's p75 values from the Chrome UX Report, Jun 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
RoundCube to Microsoft 365
| Domain | When |
|---|---|
| qroo.gob.mx | Oct 2025 |