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+
64
0
Open Page Rank 8+
1,815
38
Open Page Rank 7+
10,501
156
Open Page Rank 6+
24,517
274
Open Page Rank 5+
49,547
420
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
463,081
840
United Kingdom
167,042
356
Germany
135,802
440
Canada
108,907
270
India
102,571
718
Netherlands
97,414
321
Australia
93,854
166
France
89,127
514
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, 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.