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Business Email & Office Suites

Microsoft 365 Business

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Panel rating · 6 judges · How to read the stars

Category median

Sovereignty: not determined

0–5 in half steps. 5 means the rubric's top anchor is met on the evidence.

by Microsoft Corporation · www.microsoft.com

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Microsoft 365 Business: AI-assisted analysis on whats-best.ai Microsoft 365 Business: AI-assisted analysis on whats-best.ai (dark)

Add ?theme=dark to the image address for dark backgrounds. The badge shows the category and the month of the latest evaluation, and EU-Made where that is the product’s provenance. It never shows a score.

Microsoft 365 Business at a glance

Vendor
Microsoft Corporation
Headquarters
Not stated on the vendor’s pages as of 5 Nov 2026
Data hosting
Not stated on the vendor’s pages as of 5 Nov 2026
Free plan
Not stated on the vendor’s pages as of 5 Nov 2026
Panel verdict
The AI panel rates Microsoft 365 Business 3/5, the mean of 6 judges. Microsoft 365 Business is a hosted Exchange Online suite bundled with Word, Excel, PowerPoint, Outlook, Teams and 1 TB of OneDrive per user. how scores are made
As of
Vendor pages captured 5 Nov 2026; evaluated by the panel 6 Nov 2026. all sources

Microsoft 365 Business alternatives, European ones first →

Read this page as one judge. Each weighs the same scores by what they care about.

The IT Administrator

Weighted verdict

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.

Same scores as the panel view — this lens weights them the way this judge cares.

Scored by The IT Administrator

Panel median The IT Administrator This judge’s scores over the panel median. Each label opens its reasoning below.
Scores per criterion, in stars out of 5
Criterion Panel median The IT Administrator
Mail, domains & deliverability 3.5 of 5 3.5 of 5
Calendar, contacts & office apps 4 of 5 3.5 of 5
Security, encryption & compliance archiving 3.5 of 5 3 of 5
Administration, identity & partner management 3 of 5 3 of 5
Migration, open standards & exit 3.5 of 5 3.5 of 5
European sovereignty 2.5 of 5 2.5 of 5
Pricing transparency 3 of 5 3 of 5

Mail, domains & deliverability

How this is scored

How well the mailbox itself works: custom domains and their DNS set-up, aliases, catch-all, shared and functional mailboxes, distribution lists, mailbox and attachment size limits, IMAP, POP3, SMTP and Exchange ActiveSync or MAPI for Outlook, web and mobile apps, spam and malware filtering, SPF, DKIM, DMARC and MTA-STS, out-of-office and server-side rules, send limits, and the delivery reputation of the sending infrastructure. A self-hosted groupware is judged on the mail server it ships; a suite whose mail app is only a client for another server scores at the level of that client.

0 — No mailbox at all; a product that only sends transactional mail or only reads another provider's mail without a server of its own or a documented one to pair it with.

3 — Mailboxes on a custom domain with IMAP and SMTP and a webmail; aliases, shared mailboxes, filtering and DKIM or DMARC are basic or not described.

5 — Several custom domains with a documented DNS set-up, aliases and distribution lists, shared or functional mailboxes, IMAP and SMTP plus mobile apps, spam and malware filtering, SPF and DKIM signing, mailbox size per plan stated, server-side rules and out-of-office replies.

8 — Exchange ActiveSync or native Outlook (MAPI) support, DMARC reporting and MTA-STS or DANE, catch-all and plus addressing, delegated access and send-as, quarantine an admin can review, send and attachment limits stated, and the deliverability of the outbound infrastructure documented.

10 — A mail platform a large organisation runs on: every protocol above with feature parity stated per client, inbound and outbound gateways configurable, journaling, DANE and MTA-STS enforced, delivery monitoring and bounce analysis for admins, and mail flow documented end to end.

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The IT Administrator

Exchange Online is documented as a full hosted mailbox platform: quotas of 50 GB and 100 GB per plan (2 GB for Kiosk), default message sizes of 35 MB sending and 36 MB receiving with administrator-configurable limits up to 150 MB, anti-spam and anti-malware with multiple engines across all plans, quarantine an administrator manages, shared mailboxes up to 50 GB without a license, ActiveSync policies, and custom outbound routing with SMTP relay. That covers the working set for my three hundred mailboxes. We found no public information on SPF, DKIM, DMARC or MTA-STS, catch-all or plus addressing, or the delivery reputation of the outbound infrastructure, so it stays below the top level. 2 3 4

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Calendar, contacts & office apps

How this is scored

What the office plans and writes with: shared and team calendars, free/busy lookup, meeting invitations across providers, room and resource booking, shared address books and a company directory, CalDAV and CardDAV or ActiveSync for phones, Outlook calendar sync, tasks, online office documents with co-editing, file storage that comes with the suite, video meetings and chat inside the bundle, and the desktop and mobile apps.

0 — Mail only, with no calendar or contacts of any kind.

3 — A personal calendar and address book in the webmail; sharing, resources, sync protocols and office apps are basic or not described.

5 — Shared calendars and address books, meeting invitations with free/busy lookup, CalDAV and CardDAV or ActiveSync sync to phones and desktop clients, a company-wide address book, tasks, and either online office documents or a documented integration with an office suite.

8 — Room and resource booking with approval, delegated calendar access, Outlook calendar and contacts sync documented, co-editing of documents and spreadsheets in the browser, file storage with sharing, video meetings in the bundle, and apps for desktop, iOS and Android.

10 — A full office suite that replaces Microsoft 365 for a whole organisation: every function above with Microsoft file formats edited without loss, scheduling across organisations, resource planning, offline editing, an accessible interface stated against a standard, and feature parity across web, desktop and mobile documented.

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The IT Administrator

Conference room management, resource mailboxes, calendar sharing and federated sharing are documented, and the API reaches calendar data in shared as well as primary mailboxes, which covers the delegation model I run today. Word, Excel, PowerPoint and Outlook ship for desktop, web and mobile in the same plans, with Teams, 1 TB OneDrive per user, and global address lists and offline address books for the company directory. We found no public information on browser co-editing, video meetings, cross-organisation free/busy or accessibility conformance, so I cannot place it at the top level. 1 2 3 7 9

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Security, encryption & compliance archiving

How this is scored

How mail and documents are protected and kept: TLS enforced in transit, encryption at rest, end-to-end encryption or S/MIME and PGP, who at the provider can read a mailbox, two-factor authentication and passkeys, phishing, malware and account-takeover protection, audit-proof archiving that meets GoBD, retention policies and legal hold, eDiscovery, backups and restore of deleted mail, a transparency report on authority requests, and certifications (ISO 27001, BSI C5, SOC 2) with their scope.

0 — No security information of any kind; no encryption, two-factor sign-in or archiving stated.

3 — Encrypted connections and a password login; encryption at rest, two-factor sign-in, archiving and certifications are basic or not described.

5 — TLS in transit and encryption at rest stated, two-factor authentication, spam, phishing and malware protection, restore of deleted mail for a stated period, archiving offered (built in or as an add-on), and a certification such as ISO 27001 stated for the data centres or the service.

8 — End-to-end encryption, S/MIME or PGP supported, GoBD-compliant archiving documented, retention policies and legal hold, enforced two-factor or passkeys for all users, a transparency report on authority requests, and certifications such as ISO 27001 or BSI C5 published with their scope and auditor.

10 — Security that holds up in an audit of a regulated organisation: zero-access or customer-held keys where the provider cannot read mail, eDiscovery, tamper-proof archive with documented verification, every certification published with its report or attestation available, independent security audits or open-source code reviewed, and incident disclosure documented.

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The IT Administrator

S/MIME signing and encryption, message encryption with a 100 MB limit, and single item and deleted mailbox recovery are documented, and the retention side is unusually deep: retention policies across Exchange, SharePoint, OneDrive, Teams and Copilot locations, up to 1,800 policies per tenant, 50 holds per mailbox, record declaration with proof of disposition for up to seven years, and content search with label conditions. We found no public information on two-factor enforcement, encryption at rest, certifications such as ISO 27001 or BSI C5, GoBD-compliant archiving, or a transparency report on authority requests, so the compliance archiving is better evidenced than the security attestations. 3 4 6 7

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Administration, identity & partner management

How this is scored

How an IT team or an IT service provider runs it: an admin console for users, groups, mailboxes and domains, admin roles, single sign-on (SAML or OpenID Connect), sync with Active Directory, Entra ID or LDAP, SCIM provisioning, mobile device policies and remote wipe, audit logs of admin and user actions, usage reports, a documented API for provisioning, multi-tenant or reseller accounts for partners managing several customers, and the support channels and response times per plan.

0 — No administration; one login per mailbox and nothing managed centrally.

3 — A web console to add mailboxes and aliases; roles, single sign-on, directory sync and audit logs are basic or not described.

5 — An admin console for users, groups, mailboxes and domains, admin roles, two-factor sign-in enforceable by the admin, password policies, a documented API or command line for provisioning, an activity or audit log, and business support by phone or ticket stated per plan.

8 — Single sign-on (SAML or OpenID Connect), Active Directory, Entra ID or LDAP sync, SCIM provisioning, mobile device policies with remote wipe, audit logs exportable, delegated administration, partner or reseller accounts that manage several customer organisations, and support response times stated.

10 — Administration that scales across many organisations: every setting reachable by API with parity stated, granular role scopes, policies by group, logs streamed to a SIEM, white-label partner offerings with separate billing, and an SLA with service credits published.

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The IT Administrator

The Microsoft 365 admin center, Exchange admin center and remote PowerShell are documented, Exchange Online integrates fully with Microsoft Entra ID with group-policy management, and API provisioning is strong: Microsoft Graph with SDKs, and PowerShell to provision users, groups and teams, pull usage reports and send security alerts. Mobile devices run under ActiveSync policies with documented device and deletion limits. We found no public information on directory synchronisation with Active Directory, SCIM, exportable audit logs, reseller accounts managing several customers, or support response times, which is what I would still need to run this for a machine builder. 1 3 4 11 12

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Migration, open standards & exit

How this is scored

How the organisation gets in and out: migration from Exchange, Microsoft 365, Google Workspace or another IMAP provider with a documented tool or service, mail, calendars and contacts carried over, coexistence during a move, standard protocols (IMAP, CalDAV, CardDAV, JMAP, open document formats) rather than proprietary ones, export of a mailbox and of the whole organisation in standard formats (mbox, EML, PST, ICS, vCard), open-source code or a self-hosted edition, what happens to data when the contract ends, and how domains and DNS are handed back.

0 — No way to bring mail in or take it out; a proprietary store with no IMAP access or export.

3 — IMAP access to mail; a migration path, calendar and contacts export and the end-of-contract handling are basic or not described.

5 — A documented migration from Exchange, Microsoft 365 or Google (a tool, an import or a service), mail, calendars and contacts imported, IMAP, CalDAV and CardDAV or ActiveSync access, export of mail, calendars and contacts in standard formats, and the deletion of data after the contract ends stated.

8 — A migration service or tool that moves whole organisations with calendars and permissions, coexistence with free/busy during the move, open document formats supported natively, export of the whole organisation by the admin, an open-source code base or a self-hosted edition, and a data return period after cancellation stated.

10 — An exit that costs nothing but time: every record exportable in open formats with the method documented, a self-hosted open-source edition with feature parity stated, migration in and out documented with the same tools, and a contractual data return and deletion with confirmation.

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The IT Administrator

Migration from my on-premises Exchange is documented three ways — cutover for up to 2,000 mailboxes (realistically 150), staged for Exchange 2003/2007 beyond 2,000, and hybrid for gradual moves keeping both on-premises and online mailboxes — plus IMAP from Gmail and Exchange, a PST import service by network upload or drive shipping, cross-tenant migration, Express migration and FastTrack specialists. The IMAP path is explicitly limited to mail folders, with contacts, calendar items and tasks left to the user. We found no public information on permissions or free/busy moving during coexistence or on a data return period after cancellation; deletion of all associated data on cancellation is stated. 1 3 5 7

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European sovereignty

How this is scored

Who the contracting entity and the parent company are, where mailboxes, calendars, contacts, documents and backups are stored and processed, who at the provider or its subprocessors can access them, and who the subprocessors are (data centres, spam filtering, support, payment, AI features). Independently sourced by the sovereignty pipeline. An EU data region offered by a non-EU parent is part of the chain, not the whole of it. A self-hosted or open-source edition the customer runs on its own European servers counts as the customer's chain, whatever the vendor's seat.

0 — Non-EU vendor and contracting entity, hosting unstated, subprocessors unnamed, and no data processing agreement offered.

3 — A privacy policy and a data processing agreement exist, but hosting location is unstated or non-EU and the subprocessors are not listed.

5 — EU hosting available and an EU contracting entity or EU representative, but parts of the chain (spam filtering, support, backups, AI features) run through non-EU providers or a non-EU parent without a stated safeguard.

8 — EU hosting on named infrastructure, EU contracting entity, subprocessors listed with their locations, a data processing agreement published, and security certifications (ISO 27001, BSI C5) stated — or a self-hosted edition documented that keeps every mailbox on the customer's own servers.

10 — Sovereign end to end and evidenced: European ownership, entity, hosting and every subprocessor, or a self-hosted open-source edition with no call home, data export and deletion documented, and certifications published with their scope rather than implied.

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The IT Administrator

The EU Data Boundary documentation commits Microsoft to store and process customer data for Microsoft 365 tenants with an EU or EFTA sign-up location, in datacenter countries including Germany, France, the Netherlands and Ireland, with pseudonymised system logs and minimum-retention policies for each log type. The parent is a US company, the same documentation states customer data will continue to be transferred outside the boundary in limited circumstances, and Multi-Geo customers are out of scope. We found no public information on a data processing agreement, an EU contracting entity, or a subprocessor list with locations. 3 8

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Pricing transparency

How this is scored

Whether a buyer can compute the real annual cost from public pages alone: price per user or mailbox per tier, storage per user, what shared mailboxes, aliases and extra domains cost, which features (archiving, office apps, SSO, advanced security, more storage) cost extra, the first-year discount and the regular price after it, minimum users and term, monthly versus annual billing, and VAT.

0 — No public prices at all; every customer is a sales call.

3 — A starting price per user exists, but how cost scales with storage, users, add-ons or after the first year is unclear.

5 — Tiers are public with their price per user and main inclusions, but at least one commonly needed piece (archiving, extra storage, shared mailboxes, SSO, the price after the introductory period) is unpriced or "on request".

8 — Every tier priced publicly per user with storage, add-ons priced, the regular price after any introductory discount stated, minimum users and term stated, monthly and annual billing compared, and VAT treatment stated.

10 — Complete price computability: annual cost derivable for a given number of users, storage and add-ons, with every support, migration and archive fee and the cancellation and data-return terms published.

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The IT Administrator

Exact figures are public — Business Basic at 6,07 € per user per month with annual billing, Standard and Premium at 20,36 € and 27,73 € (both shown bundled with Copilot Business), all excluding VAT — with the one-month trial conditions, a 7-day withdrawal right, cancellation through the admin center, mailbox quotas per plan, 1 TB OneDrive per user, and shared mailboxes and conference rooms without a subscription. We found no public information on monthly versus annual billing comparison, the plan prices without Copilot, or add-on prices such as the 100 GB shared mailbox upgrade, extra storage or additional domains, so I cannot fully compute the annual cost for three hundred mailboxes. 1 3 4

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European sovereignty — proven facts

0 of 6 dimensions proven

Built only from facts shown on the vendor's own pages. A dimension we could not prove is left open, not scored as zero.

Hosting location Not determined ⚠ unverified — uncited Report an error
Hosting options Not determined ⚠ unverified — uncited Report an error
Open source Not determined — uncited Report an error
Data processing agreement Not determined — uncited Report an error
Transfer impact assessment Not determined — uncited Report an error

Questions about Microsoft 365 Business

Is Microsoft 365 Business European?

No. whats-best.ai classifies Microsoft 365 Business as Rest of world.

Where does Microsoft 365 Business store data?

Not stated on the vendor’s pages as of 5 Nov 2026.

Does Microsoft 365 Business have a free plan?

Not stated on the vendor’s pages as of 5 Nov 2026.

What are the best alternatives to Microsoft 365 Business?

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 among the other 14 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 highest-rated European alternative is grommunio (EU-Made). Ratings are the AI panel’s opinion, formed from public evidence: how scores are made. The full list, with European products first: Microsoft 365 Business alternatives.

Where this could be wrong

What we left out

A claim that does not survive our checks costs us the claim, not the page. This is what was taken off this one.

Do you know more about Microsoft 365 Business? Tell us Report an error on this page

Sources (12)

The pages every claim on this page was read from — each one checked, dated, and kept verifiable.

  1. 1 Vendor homepage (Microsoft 365 Business) www.microsoft.com Checked 5 Nov 2026 Details →
  2. 2 Features page (Exchange Online) www.microsoft.com Checked 5 Nov 2026 Details →
  3. 3 Service description (Exchange Online) learn.microsoft.com Checked 5 Nov 2026 Details →
  4. 4 Service description (limits) learn.microsoft.com Checked 5 Nov 2026 Details →
  5. 5 Product documentation (migration) learn.microsoft.com Checked 5 Nov 2026 Details →
  6. 6 Product documentation (retention) learn.microsoft.com Checked 5 Nov 2026 Details →
  7. 7 API documentation learn.microsoft.com Checked 5 Nov 2026 Details →
  8. 8 EU Data Boundary documentation learn.microsoft.com Checked 5 Nov 2026 Details →
  9. 9 Mail, domains & deliverability — found from sitemap developer.microsoft.com Checked 5 Nov 2026 Details →
  10. 10 Calendar, contacts & office apps — found from sitemap developer.microsoft.com Checked 5 Nov 2026 Details →
  11. 11 Administration, identity & partner management — found from sitemap developer.microsoft.com Checked 5 Nov 2026 Details →
  12. 12 Administration, identity & partner management — found from sitemap developer.microsoft.com Checked 5 Nov 2026 Details →