Microsoft 365 vs Zimbra
Head-to-head usage across the sites we track.
Top sites by authority
Microsoft 365 · Zimbra · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
65
0
Open Page Rank 8+
1,824
35
Open Page Rank 7+
10,541
136
Open Page Rank 6+
24,582
252
Open Page Rank 5+
49,583
393
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 · Zimbra · share of sites in each country using one or the other
United States
452,995
848
United Kingdom
171,261
373
Germany
135,089
458
Canada
108,446
284
India
100,575
708
Netherlands
100,183
334
France
93,767
519
Australia
91,309
156
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Microsoft 365 | Zimbra |
|---|---|---|
| LCP | 1.8 s | 1.7 s |
| INP | 75 ms | 100 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.