# Business Email & Office Suites — software compared by an AI panel As of 6 Nov 2026, the panel rates [grommunio (3.5/5)](https://whats-best.ai/software/business-email/grommunio), [Infomaniak kSuite (3.5/5)](https://whats-best.ai/software/business-email/infomaniak-ksuite) and [Nextcloud Hub (Groupware & Office) (3.5/5)](https://whats-best.ai/software/business-email/nextcloud-hub) 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](https://whats-best.ai/software/business-email/grommunio) (EU-Made). Of the products whose own pages state a free plan, the panel rates [grommunio](https://whats-best.ai/software/business-email/grommunio) highest. Ratings are the AI panel’s opinion, formed from public evidence: [how scores are made](https://whats-best.ai/methodology#ordering). - Canonical page: https://whats-best.ai/software/business-email - Data as of: 2026-11-06 **AI-generated.** Every rating here is the opinion of a panel of AI judges, formed from public evidence against a published rubric — an analysis, not a hands-on test. Listed alphabetically; no placement is for sale. How scores are made: https://whats-best.ai/methodology ## Products | Product | Vendor | Provenance | Panel rating | Sovereignty | Markdown | |---|---|---|---|---|---| | [Fastmail for Business](https://whats-best.ai/software/business-email/fastmail) | Fastmail Pty Ltd | Rest of world | 2/5 | not determined | [md](https://whats-best.ai/software/business-email/fastmail.md) | | [Google Workspace](https://whats-best.ai/software/business-email/google-workspace) | Google LLC | Rest of world | 2.5/5 | not determined | [md](https://whats-best.ai/software/business-email/google-workspace.md) | | [grommunio](https://whats-best.ai/software/business-email/grommunio) | grommunio GmbH | EU-Made | 3.5/5 | not determined | [md](https://whats-best.ai/software/business-email/grommunio.md) | | [Hostpoint E-Mail & Cloud Office](https://whats-best.ai/software/business-email/hostpoint-email) | Hostpoint AG | UK / wider Europe | 2.5/5 | not determined | [md](https://whats-best.ai/software/business-email/hostpoint-email.md) | | [Infomaniak kSuite](https://whats-best.ai/software/business-email/infomaniak-ksuite) | Infomaniak Network SA | UK / wider Europe | 3.5/5 | not determined | [md](https://whats-best.ai/software/business-email/infomaniak-ksuite.md) | | [IONOS E-Mail & Office](https://whats-best.ai/software/business-email/ionos-email-office) | IONOS SE | EU-Made | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/ionos-email-office.md) | | [mailbox.org Business](https://whats-best.ai/software/business-email/mailbox-org) | Heinlein Hosting GmbH | EU-Made | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/mailbox-org.md) | | [Microsoft 365 Business](https://whats-best.ai/software/business-email/microsoft-365-business) | Microsoft Corporation | Rest of world | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/microsoft-365-business.md) | | [Nextcloud Hub (Groupware & Office)](https://whats-best.ai/software/business-email/nextcloud-hub) | Nextcloud GmbH | EU-Made | 3.5/5 | not determined | [md](https://whats-best.ai/software/business-email/nextcloud-hub.md) | | [ONLYOFFICE Workspace](https://whats-best.ai/software/business-email/onlyoffice-workspace) | Ascensio System SIA | EU-Made | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/onlyoffice-workspace.md) | | [Proton for Business](https://whats-best.ai/software/business-email/proton-business) | Proton AG | UK / wider Europe | 3.5/5 | not determined | [md](https://whats-best.ai/software/business-email/proton-business.md) | | [Runbox](https://whats-best.ai/software/business-email/runbox) | Runbox Solutions AS | UK / wider Europe | 2.5/5 | not determined | [md](https://whats-best.ai/software/business-email/runbox.md) | | [STRATO Mail](https://whats-best.ai/software/business-email/strato-mail) | STRATO GmbH | EU-Made | 2/5 | not determined | [md](https://whats-best.ai/software/business-email/strato-mail.md) | | [Tuta Business](https://whats-best.ai/software/business-email/tuta-business) | Tutao GmbH | EU-Made | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/tuta-business.md) | | [Zoho Workplace](https://whats-best.ai/software/business-email/zoho-workplace) | Zoho Corporation | Rest of world | 3/5 | not determined | [md](https://whats-best.ai/software/business-email/zoho-workplace.md) | Ratings are out of 5 (the panel's mean, half steps). Sovereignty is scored only when all 6 dimensions (legal entity, hosting location, hosting options, open source, data processing agreement and transfer impact assessment) are proven from the vendor's own pages. ## Head-to-head comparisons - [Google Workspace vs Microsoft 365 Business](https://whats-best.ai/compare/google-workspace-vs-microsoft-365-business) ([md](https://whats-best.ai/compare/google-workspace-vs-microsoft-365-business.md)): 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, administration and identity 6.3 to 5.2, security and compliance 6.5 to 5.8, with six judges leaning its way on mail, calendar and office, and migration. - [mailbox.org Business vs Tuta Business](https://whats-best.ai/compare/mailbox-org-vs-tuta-business) ([md](https://whats-best.ai/compare/mailbox-org-vs-tuta-business.md)): 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; five lean), migration and portability (5.0 vs 3.8; five lean). - [Microsoft 365 Business vs Proton for Business](https://whats-best.ai/compare/microsoft-365-business-vs-proton-business) ([md](https://whats-best.ai/compare/microsoft-365-business-vs-proton-business.md)): Microsoft 365 Business and Proton for Business split this bench. - [Google Workspace vs Infomaniak kSuite](https://whats-best.ai/compare/google-workspace-vs-infomaniak-ksuite) ([md](https://whats-best.ai/compare/google-workspace-vs-infomaniak-ksuite.md)): 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 identity 6.8 to 5.2 and calendar and office 6.8 to 6.0, with 5 judges leaning kSuite on both; pricing transparency 7.0 to 6.8; and security and compliance 6.0 to 5.8, where 1 judge leans Google Workspace, 2 lean kSuite and 3 tie. ## Questions ### What is the best Business Email & Office Suites software? As of 6 Nov 2026, the panel rates [grommunio (3.5/5)](https://whats-best.ai/software/business-email/grommunio), [Infomaniak kSuite (3.5/5)](https://whats-best.ai/software/business-email/infomaniak-ksuite) and [Nextcloud Hub (Groupware & Office) (3.5/5)](https://whats-best.ai/software/business-email/nextcloud-hub) 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](https://whats-best.ai/software/business-email/grommunio), [Infomaniak kSuite](https://whats-best.ai/software/business-email/infomaniak-ksuite), [Nextcloud Hub (Groupware & Office)](https://whats-best.ai/software/business-email/nextcloud-hub), [Proton for Business](https://whats-best.ai/software/business-email/proton-business), [ONLYOFFICE Workspace](https://whats-best.ai/software/business-email/onlyoffice-workspace), [IONOS E-Mail & Office](https://whats-best.ai/software/business-email/ionos-email-office), [mailbox.org Business](https://whats-best.ai/software/business-email/mailbox-org), [Tuta Business](https://whats-best.ai/software/business-email/tuta-business), and 3 more (see [the full list](https://whats-best.ai/software/business-email#products)). The highest-rated of them is [grommunio](https://whats-best.ai/software/business-email/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](https://whats-best.ai/software/business-email/grommunio), [Infomaniak kSuite](https://whats-best.ai/software/business-email/infomaniak-ksuite), [Zoho Workplace](https://whats-best.ai/software/business-email/zoho-workplace), [Tuta Business](https://whats-best.ai/software/business-email/tuta-business) and [STRATO Mail](https://whats-best.ai/software/business-email/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](https://whats-best.ai/methodology). ## The bench 6 AI judges built for this category, each versioned and scoring independently; disagreement is printed, not averaged away. - **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. --- Cite as: whats-best.ai, "Business Email & Office Suites", AI panel comparison, as of 2026-11-06. https://whats-best.ai/software/business-email