Category
Business Email & Office Suites
As of 6 Nov 2026, the panel rates grommunio (3.5/5), Infomaniak kSuite (3.5/5) and Nextcloud Hub (Groupware & Office) (3.5/5) highest in Business Email & Office Suites, out of 15 products evaluated. Ratings that look equal are rounded to half stars; the order uses the unrounded rating, then the name. The highest-rated European option is grommunio (EU-Made). Of the products whose own pages state a free plan, the panel rates grommunio highest. Ratings are the AI panel’s opinion, formed from public evidence: how scores are made.
The bench 6 judges, built for this category
The Small Firm Owner v1.0
Runs a tax and accounting firm of twelve in Lower Saxony. Every member of staff lives in Outlook, the shared "kanzlei@" mailbox is the busiest address in the office, and the meeting room is booked by shouting across the corridor. Wants mail on the firm's own domain that arrives, a shared calendar and address book on every phone, a move from the old provider that does not lose a single client thread, and a per-user price that is still the price in the second year.
The IT Administrator v1.0
IT administrator at a machine builder in Baden-Württemberg with three hundred mailboxes, an on-premises Exchange that reaches end of support, and Active Directory as the source of every account. Wants Outlook to keep working without a plug-in nobody maintains, shared mailboxes and room booking, single sign-on and directory sync, mobile devices that can be wiped, an API for provisioning, and a migration that moves calendars and permissions, not only mail.
The Public Sector IT Lead v1.0
Head of IT at a district administration in Bavaria with eleven hundred staff, told by the council to leave Microsoft within three years. Has read what Schleswig-Holstein did and what it cost. Needs mail, calendars and documents that a whole administration can work in, open formats and open source where possible, BSI C5 or ISO 27001 on paper, a provider whose owners answer to European law only, and an exit plan before the contract is signed.
The IT Service Provider v1.0
Runs a six-person IT service company in Austria that looks after mail for forty client firms, from a two-person architect's office to a hotel group. Spends Mondays on mails that landed in spam and phones that stopped syncing. Wants one partner console for every client, DKIM and DMARC set up without a ticket, migrations it can run itself, support that answers within the hour, and margins it can calculate before it quotes.
The Data Protection Officer v1.0
Data protection officer for a group of nine medical practices in North Rhine-Westphalia, where a referral letter sent by mail is patient data under professional secrecy. Reads the subprocessor list and the transparency report before the feature page, asks who at the provider can open a mailbox and under which law, and wants encryption the practices can actually use with outside doctors, archiving that satisfies the tax office, and a data processing agreement that names every server.
The Skeptic v1.0
Has seen "hosted in Germany" from a provider whose spam filter and support desk sit in the United States, "Exchange-compatible" that meant IMAP with a calendar plug-in, and a first-year price of one euro that became seven. Asks which protocols Outlook really uses, whether the archive would survive a tax audit, what the certification actually covers — and how ten years of mail, calendars and contacts would leave.
Every judge is AI, versioned, and scores independently against the same published anchors — disagreement is printed, not averaged away.
Head-to-head
Google Workspace vs Microsoft 365 Business
Microsoft 365 Business holds the higher mean on five of seven criteria: mail and deliverability 7.0 to 5.7, calendar and office 7.5 to 6.0, migration and portability 7.0 to 4.3, ad...
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mailbox.org Business vs Tuta Business
mailbox.org Business leads four criteria — mail and deliverability (5.5 vs 5.0; four lean), calendar and office (5.5 vs 4.0; five lean), administration and identity (5.3 vs 4.2; fi...
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Microsoft 365 Business vs Proton for Business
Microsoft 365 Business and Proton for Business split this bench.
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Google Workspace vs Infomaniak kSuite
Infomaniak kSuite is ahead on six of seven criteria: sovereignty 7.7 to 4.7 and migration and portability 6.0 to 4.3, with 6 judges leaning kSuite on both; administration and ident...
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Evaluated
Listed alphabetically by default. Sorting by rating or sovereignty is your choice and follows the published method. Scores are the panel’s opinion, formed from public evidence. How scores are made →
Fastmail for Business
Rest of worldSovereignty: not determined
Google Workspace
Rest of worldSovereignty: not determined
grommunio
EU-MadeSovereignty: not determined
Hostpoint E-Mail & Cloud Office
UK / wider EuropeSovereignty: not determined
Infomaniak kSuite
UK / wider EuropeSovereignty: not determined
IONOS E-Mail & Office
EU-MadeSovereignty: not determined
mailbox.org Business
EU-MadeSovereignty: not determined
Microsoft 365 Business
Rest of worldSovereignty: not determined
Nextcloud Hub (Groupware & Office)
EU-MadeSovereignty: not determined
ONLYOFFICE Workspace
EU-MadeSovereignty: not determined
Proton for Business
UK / wider EuropeSovereignty: not determined
Runbox
UK / wider EuropeSovereignty: not determined
STRATO Mail
EU-MadeSovereignty: not determined
Tuta Business
EU-MadeSovereignty: not determined
Zoho Workplace
Rest of worldSovereignty: not determined
Questions about Business Email & Office Suites software
What is the best Business Email & Office Suites software?
As of 6 Nov 2026, the panel rates grommunio (3.5/5), Infomaniak kSuite (3.5/5) and Nextcloud Hub (Groupware & Office) (3.5/5) highest of the 15 Business Email & Office Suites products evaluated. Ratings that look equal are rounded to half stars; the order uses the unrounded rating, then the name. The ratings are the AI panel’s opinion, formed from public evidence. Each judge weighs the criteria differently, so read the scores for the criteria that matter to you.
Which Business Email & Office Suites software is European?
As of 6 Nov 2026, 11 of the 15 Business Email & Office Suites products evaluated are European by provenance: grommunio, Infomaniak kSuite, Nextcloud Hub (Groupware & Office), Proton for Business, ONLYOFFICE Workspace, IONOS E-Mail & Office, mailbox.org Business, Tuta Business, and 3 more (see the full list). The highest-rated of them is grommunio (EU-Made).
Which Business Email & Office Suites tools have a free plan?
As of 6 Nov 2026, the vendors’ own pages state a free plan for grommunio, Infomaniak kSuite, Zoho Workplace, Tuta Business and STRATO Mail. Each product page links the pricing page it was read from.
How were these Business Email & Office Suites tools evaluated?
Each product is scored by a bench of 6 AI judges built for this category, against the same published rubric of 7 criteria, using public evidence captured from the vendor’s own pages. Every score is AI-generated; nobody tested the products hands-on, and no score can be bought. The full method is on the methodology page.