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Microsoft 365 vs Posteo

Microsoft 365

7.4/ 10

Higher score

PosteoIndie

8.5/ 10

Across 4 measured dimensions: Microsoft 365 wins 0, Posteo wins 2 (2 tie / n/a)

[01]

Side by side.

8 dimensions

Metric	Microsoft 365	Posteo
Score Winner: right	7.4	8.5
Δ 90 days	— flat	— flat
Parent & badge Winner: right	Microsoft Corp.	IndependentIndie
Founded	2011	2009
Best for	Businesses that need Exchange features and desktop Office	Users on a @posteo.* address who don't need a custom domain
Price per mo Winner: right	$6.00/ mo	$1.10/ mo
Renewal multiplier	—	—
Tagline	Outlook + Exchange + Office, billed by the seat forever	€1/month ethical mail — no custom domain, ever

[02]

What works, what doesn't.

Per provider

Microsoft 3654 pros · 4 cons

+ Pros

✓Exchange features still unmatched for corporate mail
✓Desktop Office included on Standard
✓Strong compliance/eDiscovery features
✓Wide IT support ecosystem

– Cons

✗Admin center sprawl is genuinely terrible
✗Pricing/SKU structure changes constantly
✗2024 price hikes plus Copilot bundling
✗New Outlook regressed long-standing workflows

Posteo4 pros · 4 cons

+ Pros

✓Flat €1/month, includes 2GB and full IMAP/SMTP
✓Accepts anonymous cash payment
✓100% renewable energy and transparent reporting
✓PGP-in-browser and full encryption at rest available

– Cons

✗No custom domain support, ever
✗Address must be @posteo.* only
✗Storage upgrades cost extra per GB
✗No mobile app — relies on standard IMAP clients

Make the call

Pick one and go.

Both links are affiliate. Score doesn't move because of it.

VisitMicrosoft 365 ↗Score 7.4 VisitPosteo ↗Score 8.5

← Read full Microsoft 365 review·Read full Posteo review →

[03]

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