mailbox.org vs Microsoft 365 Business
In short: mailbox.org wins on privacy, mailbox.org wins on price, and they tie on features. The full comparison is below, last checked 22 October 2026.
mailbox.org or Microsoft 365 Business: which should you choose?
- mailbox.org suits you best if you want a company that isn't funded by advertising; to pay less: €3 a month, yearly (from summer 2026); and extras such as PGP encryption as well as catch-all address.
- Microsoft 365 Business suits you best if you want more room (50 GB, against 20 GB).
| Feature | mailbox.org | Microsoft 365 Business |
|---|---|---|
| Overall | 4.5 | 2.5 |
| Privacy | 4.5 | 1.0 |
| Price | 4.0 | 2.5 |
| Features | 5.0 | 5.0 |
| Cheapest plan | Standard €3 a month, yearly (from summer 2026) | Business Basic £5.40 per user a month, yearly, ex VAT |
| Free plan | No (30-day trial) | No |
| Storage | 20 GB | 50 GB |
| Your own domain | ✓ Yes | ✓ 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 | 2014 | 2011 |
| Free trial | 30 days free | 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 | 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.
Where they differ
- mailbox.org's cheapest plan is Standard (€3 a month, yearly (from summer 2026)); Microsoft 365 Business's is Business Basic (£5.40 per user a month, yearly, ex VAT).
- For free, mailbox.org gives you no free plan, and Microsoft 365 Business no free plan.
- mailbox.org comes with 20 GB of storage and Microsoft 365 Business with 50 GB of storage.
- Data location: Germany for mailbox.org, UK data centres for UK tenants (London, Cardiff, Durham) for Microsoft 365 Business.
- mailbox.org is based in Germany and Microsoft 365 Business in the United States, so different privacy laws apply.
- mailbox.org offers optional encryption (PGP or encrypted storage); Microsoft 365 Business doesn't encrypt mail end to end.
- Only Microsoft 365 Business is part of an advertising business.
mailbox.org and Microsoft 365 Business: your questions
Which is more private, mailbox.org or Microsoft 365 Business?
mailbox.org scores 4.5 out of 5 for privacy and Microsoft 365 Business 1. mailbox.org gives you a company that isn't funded by advertising, apps whose code is public and to sign up without proving who you are.
Which is cheaper, mailbox.org or Microsoft 365 Business?
mailbox.org is cheaper. Its Standard plan is €3 a month, yearly (from summer 2026), 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 mailbox.org and Microsoft 365 Business work with my own domain?
Yes, both do. mailbox.org: Yes. Microsoft 365 Business: Yes.
Where do mailbox.org and Microsoft 365 Business keep my email?
mailbox.org keeps it in Germany. Microsoft 365 Business keeps it in the UK data centres for UK tenants (London, Cardiff, Durham).
Prices and the latest news
- 1 September 2026 mailbox.org: €3.00 (announced 15 July 2026)
- 27 July 2026 Microsoft 365 Business: £5.40 (UK price change from 1 July 2026)
- 1 June 2026 Microsoft 365 Business: £4.90
- 1 June 2026 mailbox.org: €2.50
The latest headlines: mailbox.org news · Microsoft 365 Business news.
Also worth a look
mailbox.org vs Posteo · Microsoft 365 Business vs Posteo · mailbox.org vs Proton Mail · Microsoft 365 Business vs Proton Mail · mailbox.org vs Tuta · Microsoft 365 Business vs Tuta
How to switch
Switching takes an evening to set up. Follow the steps for your direction: mailbox.org to Microsoft 365 Business · Microsoft 365 Business to mailbox.org.