Carbon Footprint Comparison
Gmail vs Microsoft Outlook
This comparison uses the current IdleForest model for Gmail and Microsoft Outlook: their category, modeled CO2 per use unit, methodology notes, key drivers, and assumptions.
Supporting comparison page
Gmail
Work
CO2 / HOUR
Microsoft Outlook
Work
CO2 / HOUR
Data-backed comparison
Summary
When comparing Gmail and Microsoft Outlook, Microsoft Outlook generates significantly more CO2 emissions per hour (10g) than Gmail (8g). Both applications rely on devices, networks, and server infrastructure, which all contribute to their environmental impact.
Why the gap happens
- Microsoft Outlook is modeled at 10g CO2 per unit, while Gmail is modeled at 8g, so the visible gap is 2g in the current dataset.
- Both products sit in the Work category, so the difference comes from the per-product estimate and page-level methodology fields rather than a category change.
- IdleForest models Outlook as a lightweight but always-synced work app, slightly above simple email because calendar, attachment, and desktop-client activity are often bundled into the same session.
- Video, screen sharing, and participant count all change the intensity of online work tools.
What to act on first
Because Microsoft Outlook is higher in the current model, start there: Turn video off when it is not necessary for the meeting outcome.
Deep dive into their footprints
Comparison takeaways
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