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
452,995
826
United Kingdom
171,261
538
Germany
135,089
722
Canada
108,446
289
India
100,575
646
Netherlands
100,183
490
France
93,767
530
Australia
91,309
183
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 | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 600 ms |
Median site's p75 values from the Chrome UX Report, Sep 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 |