Microsoft 365 pricing, Office 365 licensing & license cost — structured advisory.

How to read this: The step from Business Standard to Business Premium (€7.27 difference per user/month) bundles Defender for Business, Defender for Office 365 P1, Intune, Conditional Access, and AIP P1 — components that would together cost roughly €18–22 per user/month if bought individually. For security-relevant user groups (management, finance, IT admins), Business Premium is therefore almost always more economical than Standard plus individual add-ons. For pure browser/frontline office users with mail requirements, Business Basic is usually sufficient.

Source: microsoft.com/en-us/microsoft-365/business/compare-all-microsoft-365-business-products — as of 19 May 2026. Price excl. VAT, Annual commit.

Important usage conditions: Microsoft expressly limits frontline licenses to staff who do not primarily carry out their work at a personal workplace with a dedicated PC. Devices are shared (kiosk mode, shared device sign-in) or private mobile devices with MAM protection are used. Anyone who uses F licenses for classic office workers risks retroactive licensing in a Microsoft audit — we review frontline eligibility regularly as part of the license analysis.

Source: microsoft.com/en-us/microsoft-365/enterprise/frontline — as of 19 May 2026.

Business case framework: A sensible pilot group is 10–25 knowledge workers with high mail, meeting, and document volume. With 25 Copilot licenses, you incur add-on cost of €682.50 per month (€7,800.00/year), on top of the base license. We typically calculate the return after 8–12 weeks based on measured time savings — more sensible than a 12-month roll-out on a hunch.

Source: microsoft.com/en-us/microsoft-365/copilot — as of 19 May 2026.

1. Backup solutions — Microsoft does not provide a full backup

Under the shared responsibility model, Microsoft bears responsibility for the infrastructure — not for your data. Anyone who wants to restore mail, OneDrive content, SharePoint libraries, or Teams chats after an accidental deletion, a ransomware incident, or a malicious insider attack will not get far with the Microsoft standard features: the recycle bin typically covers 93 days of retention (OneDrive/SharePoint), mail is protected in the Recoverable Items folder for 14 days by default (configurable to up to 30 days, considerably longer in E5 with Litigation Hold). For a full data backup with longer retention, point-in-time recovery, and cross-tenant restore options, a dedicated M365 backup solution is necessary.

Typical additional cost: €3–5 per user per month for a third-party backup solution (Veeam Backup for M365, Hornetsecurity 365 Total Backup, Acronis, Barracuda, Druva). Microsoft itself launched the Microsoft 365 Backup solution in 2024 — it sits in the same price corridor and is deeply integrated. With 100 users, that means roughly €300–500 per month or €3,600–6,000 per year in addition to the M365 license.

2. Archiving — GDPR-compliant long-term retention

For GoBD- and GDPR-compliant email and document archiving beyond 6 or 10 years, the standard mailbox features are not sufficient. In Microsoft 365 E5, Purview Premium and audit-proof retention policies are already included — an important argument for E5 when compliance obligations apply. In Business Standard, Business Premium, or E3, the advanced archiving features are missing. Anyone who has to archive in an audit-proof manner there either licenses the Exchange Online Archiving add-on SKU (€2.73 per user/month) or an external archiving solution.

Typical additional cost: €3–7 per user per month, depending on retention period and compliance requirements. For 100 users that means roughly €300–700 per month — unless E5 is licensed anyway. Anyone who switches from E3 to E5 (€21.37 extra) closes this gap implicitly — with small workforces it is worth comparing the arithmetic of both paths.

3. Training and adoption cost — the underestimated TCO driver

A Microsoft 365 license that nobody knows how to use is an investment in shelfware. Adoption has to be shaped actively: initial training for end users, in-depth training for key users per application, onboarding for newcomers, refresher sessions after feature updates. Copilot for Microsoft 365 in particular requires active training — without structured use case training you end up after 6 months with an activation rate of 20–30% instead of the achievable 60–80%.

Typical benchmark: 3–5% of license cost per year for ongoing adoption — with E3 at €39.67/user/month that is roughly €14–€24 per user per year. For 100 users that means roughly €1,400–€2,400 per year for adoption activities. For Copilot roll-outs, typically 8–12% because of the greater depth of use case discussion. arades offers training programs with an initial workshop and a 4–6 week consolidation phase that demonstrably raise this rate.

4. Admin effort — the hidden staffing item

Microsoft 365 is not “self-driving”. Tenant configuration, Conditional Access policies, compliance policies, license assignments, onboarding workflows, off-boarding, audit preparation, patch reviews — all of this requires qualified IT staff. Anyone relying on in-house admins should include the staffing item in the TCO calculation.

Typical benchmark: approx. 1 FTE M365 admin per 200–500 users, depending on complexity (multiple sites, branch offices, regulated data, many application workloads). At a gross annual salary of €70,000–85,000, a staffing effort of €140–200 per user per year arises for pure Microsoft 365 management. Anyone sourcing externally (arades Application Care, managed service contract) typically pays a predictable monthly flat rate — usually cheaper than the fixed FTE, because the capacity buffer is spread across several customers.

5. Migration cost — the one-off block

Anyone migrating from an on-premises world, a third-party provider (Google Workspace, Lotus Notes), or an old Office 365 tenant structure into a modern Microsoft 365 landscape faces a one-off effort: mailboxes, OneDrive data, SharePoint content, Teams structures, Conditional Access modeling, MFA roll-out, endpoint hardening. The migration cannot be trivialized.

Typical benchmark: The initial migration costs 30–50% of the first year's license cost. With a Microsoft 365 budget of €50,000 per year, that means a one-off migration effort of €15,000–25,000. For very large or complex setups (tenant consolidation after M&A, hybrid Exchange migration, data-classified tenants), correspondingly more.

Three TCO calculation examples for typical SMB sizes

To make the abstract percentages tangible: three example scenarios as of May 2026, calculated on the Annual list price without CSP discount. The actual arades price is 10–15% below the list price and also slightly reduces the derived adoption and backup cost.

Example A · 10-user architecture firm, Business Premium

With 10 users, the actual license cost accounts for only around 40% of the ongoing TCO — the staffing component (internal or as a managed service) is the largest block.

Example B · 80-user mid-sized company, E3 + 10 × E5 + 20 × F3

Here the license component makes up the main share of the ongoing TCO at around 62% — and the mix effect (50 E3, only 10 E5 for security-critical roles, 20 F3 for frontline) saves roughly €30,400 per year compared with blanket E5 licensing.

Example C · 300-user company, E3 + 30 × E5 + 70 × F3

At 300 users, the license component sits at around 58% of the ongoing TCO. At this size, the mix of 200 E3 + 30 E5 + 70 F3 (Copilot not included in the comparison) is roughly €18,000 per year cheaper than a blanket 300 × E3 and roughly €94,900 per year cheaper than a blanket 300 × E5 — anyone licensing across the board burns six-figure amounts per year structurally.