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
463,081
790
United Kingdom
167,042
526
Germany
135,802
721
Canada
108,907
285
India
102,571
638
Netherlands
97,414
450
Australia
93,854
181
France
89,127
491
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, Aug 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 |