Posteo vs Microsoft 365 Business
Posteo wins on privacy, Posteo wins on price and Microsoft 365 Business wins on features. Every fact below was checked on or before 22 October 2026.
Posteo or Microsoft 365 Business: which should you choose?
- Posteo suits you best if you want a provider with no advertising business behind it; to pay less: €1 a month; and features the other lacks, like PGP encryption as well as sieve filters.
- Microsoft 365 Business suits you best if you want to use your own domain, like you@yourname.co.uk; more room (50 GB, against 4 GB); and features the other lacks, like mobile apps as well as API.
| Feature | Posteo | Microsoft 365 Business |
|---|---|---|
| Overall | 4.5 | 2.5 |
| Privacy | 4.5 | 1.0 |
| Price | 5.0 | 2.5 |
| Features | 3.0 | 5.0 |
| Cheapest plan | Posteo €1 a month | Business Basic £5.40 per user a month, yearly, ex VAT |
| Free plan | No | No |
| Storage | 4 GB | 50 GB |
| Your own domain | No | ✓ Yes |
| End-to-end encryption | Optional (PGP or encrypted storage) | No |
| Company based in | Germany | United States |
| Your data is kept in | Germany | UK data centres for UK tenants (London, Cardiff, Durham) |
| Founded | 2009 | 2011 |
| Free trial | No, €1 a month from the start | One month free on some plans |
| Funded by advertising | No | Yes, or its parent company is |
| Works in any mail app | ✓ IMAP and SMTP | ✓ IMAP and SMTP |
| Calendar and contacts | ✓ Yes | ✓ Yes |
| Aliases | Yes (posteo.de only) | Yes |
| Open-source apps | ✓ Yes | No |
| Sign up without ID | ✓ Yes | No |
| White label | No | No |
| Reader offer | None | None |
| Last checked | 22 October 2026 | 22 October 2026 |
Want to add another? Open this in the compare tool.
The key differences
- Posteo's cheapest plan is Posteo (€1 a month); Microsoft 365 Business's is Business Basic (£5.40 per user a month, yearly, ex VAT).
- Posteo comes with 4 GB of storage and Microsoft 365 Business with 50 GB of storage.
- Your mail is stored in Germany with Posteo, and in the UK data centres for UK tenants (London, Cardiff, Durham) with Microsoft 365 Business.
- Posteo is based in Germany and Microsoft 365 Business in the United States, so different privacy laws apply.
- Posteo offers optional encryption (PGP or encrypted storage); Microsoft 365 Business doesn't encrypt mail end to end.
- Microsoft 365 Business lets you bring your own domain name; Posteo doesn't.
- Only Microsoft 365 Business is part of an advertising business.
- For extra addresses, Posteo has yes (posteo.de only) and Microsoft 365 Business has yes.
Posteo and Microsoft 365 Business: your questions
Which is more private, Posteo or Microsoft 365 Business?
Posteo scores 4.5 out of 5 for privacy and Microsoft 365 Business 1. Posteo gives you a provider with no advertising business behind it, open-source apps and an account that doesn't need your phone number or ID.
Which is cheaper, Posteo or Microsoft 365 Business?
Posteo is cheaper. Its Posteo plan is €1 a month, against £5.40 per user a month, yearly, ex VAT for Microsoft 365 Business's Business Basic. Check the renewal price before you pay, as some first-year prices go up.
Do Posteo and Microsoft 365 Business work with my own domain?
Only Microsoft 365 Business does (Yes). With Posteo your address stays on its own domain.
Where do Posteo and Microsoft 365 Business keep my email?
Posteo keeps it in Germany. Microsoft 365 Business keeps it in the UK data centres for UK tenants (London, Cardiff, Durham).
Recent price changes
- 27 July 2026 Microsoft 365 Business: £5.40 (UK price change from 1 July 2026)
- 1 June 2026 Microsoft 365 Business: £4.90
The latest headlines: Posteo news · Microsoft 365 Business news.
Alternatives to Posteo and Microsoft 365 Business
Posteo vs mailbox.org · Microsoft 365 Business vs mailbox.org · Posteo vs Proton Mail · Microsoft 365 Business vs Proton Mail · Posteo vs Tuta · Microsoft 365 Business vs Tuta
How to switch
Ready to move? My step-by-step guides cover your mail, contacts, forwarding and your own domain: Posteo to Microsoft 365 Business · Microsoft 365 Business to Posteo.