Microsoft 365 Business vs SimpleLogin

On privacy it's SimpleLogin. On price it's SimpleLogin. On features it's Microsoft 365 Business. Here's everything side by side, last checked 25 October 2026.

Which should you choose?

Go for Microsoft 365 Business if you'd like more room (50 GB, against none); to read your mail in any app, such as Apple Mail, Outlook or Thunderbird; and a calendar and contacts alongside your mail.
SimpleLogin suits you best if you want a provider with no advertising business behind it; the lower price ($36 a year (with Proton Pass)); and a free plan to start on.

Feature	Microsoft 365 Business	SimpleLogin
Overall	2.5	3.5
Privacy	1.0	3.0
Price	2.5	4.0
Features	5.0	Not rated
Cheapest plan	Business Basic £5.40 per user a month, yearly, ex VAT	Premium $36 a year (with Proton Pass)
Free plan	No	Yes, 10 aliases
Storage	50 GB	Forwards only
Your own domain	✓ Yes	✓ Yes
End-to-end encryption	No	No
Company based in	United States	Switzerland (Proton)
Your data is kept in	UK data centres for UK tenants (London, Cardiff, Durham)	EU
Founded	2011	2019
Free trial	One month free on some plans	Free plan
Funded by advertising	Yes, or its parent company is	No
Works in any mail app	✓ IMAP and SMTP	No, its own apps only
Calendar and contacts	✓ Yes	No
Aliases	Yes	Unlimited aliases
Open-source apps	No	✓ Yes
Sign up without ID	No	No
White label	No	No
Reader offer	None	None
Last checked	22 October 2026	25 October 2026

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The key differences

Microsoft 365 Business's cheapest plan is Business Basic (£5.40 per user a month, yearly, ex VAT); SimpleLogin's is Premium ($36 a year (with Proton Pass)).
Microsoft 365 Business has no free plan; SimpleLogin has a free plan (10 aliases).
Space: Microsoft 365 Business gives 50 GB of storage, SimpleLogin no storage, as it forwards mail on.
Microsoft 365 Business keeps your mail in the UK data centres for UK tenants (London, Cardiff, Durham), while SimpleLogin keeps it in the EU.
The companies sit under different laws: Microsoft 365 Business in United States, SimpleLogin in Switzerland (Proton).
Mail apps: Microsoft 365 Business works in any mail app over IMAP; SimpleLogin only works in its own apps.
Microsoft 365 Business (or its parent company) makes money from advertising; SimpleLogin doesn't.
Aliases: Microsoft 365 Business offers yes, SimpleLogin unlimited aliases.

Microsoft 365 Business and SimpleLogin: your questions

Is Microsoft 365 Business more private than SimpleLogin?

SimpleLogin scores 3 out of 5 for privacy and Microsoft 365 Business 1. SimpleLogin gives you a provider with no advertising business behind it and apps whose code is public.

Is Microsoft 365 Business cheaper than SimpleLogin?

SimpleLogin is cheaper. Its Premium plan is $36 a year (with Proton Pass), against £5.40 per user a month, yearly, ex VAT for Microsoft 365 Business's Business Basic. SimpleLogin also has a free plan. Check the renewal price before you pay, as some first-year prices go up.