Folio vs. Microsoft 365
Microsoft 365 bills per user.
You are one user.
Microsoft 365 bills per user, not per domain: a single Business Basic seat (~$6/month, rising to $7 on 1 July 2026) can host many custom domains as accepted domains at no extra per-domain charge, so a solo operator can run every brand on one seat. The limits are practical, not billing: those domains share one organisation identity and admin posture, and replies don't auto-pick the From by inbound domain. Operators who want each entity fully separate (its own admin centre, billing, DMARC) run a tenant per entity and pay ~$6 each — so three separate businesses run about $216/year. Folio is single-operator and flat: one subscription covers up to 3 domains on Solo ($2.99/month annual), 10 on Studio ($12/month), and unlimited on Holding Co. ($29/month) — and every domain gets its own DKIM, reputation, and an auto-picked reply From, never a per-seat charge per brand.
Microsoft 365 is the office-suite default for a reason — Outlook, Teams, Word, Excel, OneDrive, SharePoint all together at $6 per user per month for Business Basic (rising to $7 on 1 July 2026). A single tenant can host multiple custom domains as accepted domains, so on paper one operator can run every brand's email on one ~$6 seat. The catch is that those domains collapse into one organisation identity and one admin posture, and many portfolio operators instead keep each brand in its own tenant for clean separation — which is where the bill becomes ~$6 per entity.
Folio is single-operator pricing — from $2.99/month, never per seat — and gives every domain its own DKIM, its own reputation, and an automatically-picked reply-From, all under one colour-striped inbox. This page is the line-by-line of what changes — and where Microsoft 365 is still the better answer.
Updated 24 May 2026 (2026-05-24)
I · The verdict
In one sentence.
If you run a team that needs Word, Excel, Teams, SharePoint, and Outlook in one bundle, Microsoft 365 is still the right answer. If you are one operator running multiple businesses, Microsoft 365 asks you to choose: cram every brand onto one seat and share a single organisation identity, or run a tenant per entity and pay ~$6 each to keep them separate. Folio gives each domain its own identity, DKIM, and reputation under one reading surface and one flat price — without that trade.
II · Feature by feature
Feature by feature.
- Price for 1 user, 1 domain$6.00 / user / month$2.99 / month
- Price for 1 user, 3 domains$6/mo on one seat (shared identity) — or $18/mo for 3 separate tenants$2.99 / month
- Price for 1 user, 10 domains$6/mo on one seat (shared identity) — or $60/mo for 10 separate tenants$12.00 / month (Studio)
- Multi-domain reading modelOne shared identity on a single seat, or a separate Outlook inbox per tenantOne inbox, colour-striped per domain
- Reply From auto-selected by inbound domainWithin a tenant; not across tenantsAlways, across every bound domain
- DKIM per custom domainYes, enabled per accepted domain in adminYes, generated automatically at bind
- Mailbox storage50 GB per userScales with usage; attachments up to 15 MiB
- Word / Excel / PowerPoint web appsIncludedNot included
- Teams meetings & chatIncludedNot included
- OneDrive / SharePoint1 TB per user / SharePoint sitesNot included
- CalendarFull Outlook calendarInbox-side agenda + RSVP for invites; subscribable iCal feed
- Sign-inPassword + MFA (Authenticator) or passkeyMagic-link (15-min single-use) or passkey — no password
- Admin tenants to manageOne on a single shared seat; one per entity if you separate tenantsOne
- Bookkeeping (invoices to reconcile)One per tenantOne
III · A deeper look
Microsoft 365 is Office, not just email.
The honest case for Microsoft 365 is that you're not paying for email. You're paying for Word + Excel + PowerPoint + Teams + OneDrive + SharePoint, with Outlook attached. If your week is built around Office documents and Teams calls, you're going to keep paying Microsoft regardless of what your inbox does.
Folio is not a replacement for that bundle. If you live in Excel, keep Microsoft 365 — and route your domains through Folio for the per-identity reply behaviour and colour-striped inbox you don't get from Microsoft today.
If your week is mostly browser tabs, Google Docs, Notion, and Stripe — and Office is something you open three times a year — you're paying $6/user/month for software you barely use.
IV · A deeper look
The per-user model is priced for teams.
Microsoft 365's $6/user/month figure (rising to $7 on 1 July 2026) assumes N people, each with a mailbox. That's a fine assumption for a marketing team or a law firm. For a portfolio operator it forces a choice, because Microsoft 365's billing follows users, not domains.
Option one: add every brand to a single tenant as accepted domains on one seat. You pay once (~$6/month), but the domains collapse into one organisation identity, replies don't auto-pick the From by inbound domain, nothing separates the brands visually, and the whole tenant reads as one company. Option two: give each entity its own tenant for clean separation — its own admin centre, billing, and DMARC posture — and now you're paying ~$6 per entity. At three businesses run as separate tenants, that's about $216/year.
Folio removes the trade. One operator pays one flat price, every domain you bind gets its own DKIM and reputation and an auto-picked reply-From, and the inbox stays one colour-striped reading surface.
V · A deeper look
The admin-console tax, itemised.
If you run separate tenants for clean separation, each Microsoft 365 tenant has its own admin centre, its own Exchange settings, its own DKIM enablement step in security.microsoft.com, its own DMARC posture, its own MFA enrollment, and its own billing portal. Multiply by three tenants and the quarterly maintenance becomes a weekend chore. (Run everything on one seat and you avoid that tax — but you give up per-brand separation to do it.)
Folio collapses that into one admin surface. One DNS wizard per bound domain, one billing page, one suppression list, one support channel — and every domain still keeps its own identity and reputation. Less software to manage and fewer places for a misconfiguration to live.
VI · The arithmetic, per month (1 operator)
The numbers, in US dollars.
| Domains you run | M365 — one seat¹ | M365 — a tenant each² | Folio (annual) |
|---|---|---|---|
| 1 | $6.00 | $6.00 | $2.99 |
| 3 | $6.00 | $18.00 | $2.99 |
| 5 | $6.00 | $30.00 | $12.00 |
| 10 | $6.00 | $60.00 | $12.00 |
| 15 | $6.00 | $90.00 | $29.00 |
Common questions
Questions readers ask.
Does Microsoft 365 charge per domain?
- No — Microsoft 365 bills per user. A single tenant can host many custom domains as accepted domains at no extra per-domain charge, so a solo operator can run every brand on one ~$6/month seat (rising to $7 on 1 July 2026). The limits are practical, not billing: the accepted domains share one organisation identity and one admin posture, replies don't auto-pick the From by inbound domain, and nothing separates the brands visually. Operators who want each entity fully separate — its own admin centre, billing, and DMARC — run a tenant per entity and pay ~$6 each.
What's the best Microsoft 365 alternative for a small business with multiple custom domains?
- If your need is multiple custom domains under one operator, the best fit is a single-operator, multi-domain inbox priced per operator rather than per user. Microsoft 365 can host them all on one ~$6 seat, but they share one identity and reading model; keeping them separate means a tenant (and another ~$6 seat) per brand. Folio starts at $2.99/month annual on Solo and gives every bound domain its own DKIM, reputation, and auto-picked reply From under one colour-striped inbox. You give up Word / Excel / Teams / OneDrive — keep those in a separate tool if you need them.
Can Microsoft 365 give every custom domain its own DKIM signature?
- Yes — Microsoft 365 supports enabling DKIM per accepted domain inside Exchange Online, even when several domains live on one tenant and one seat. The harder problem is everything around the DKIM key: on a shared seat the domains read as one organisation and replies don't auto-pick From by inbound domain, while keeping them truly separate means a tenant (and license) per brand. The DKIM mechanics work; the identity and reading model are what break for a portfolio of one.
Can I keep Word and Excel and just move email?
- Yes. Microsoft 365 Apps for Business is $8.25/user/month and is the bundle without email — it gives you the desktop Word, Excel, PowerPoint, Outlook (without hosted mailbox), and OneDrive 1 TB. Move email to Folio while keeping Apps for Business for your Office needs. Many multi-business operators end up at exactly this split.
What about Teams?
- Teams is the load-bearing reason most Microsoft 365 customers stay. Folio doesn't replace Teams. If Teams is essential, keep a Microsoft 365 seat on one primary domain for the Office and Teams components, and route every other domain's mail through Folio for the per-identity reply behaviour.
How does the migration from Exchange Online to Folio work?
- It's a DNS cutover per domain. Lower the MX TTLs ahead of time, publish Folio's MX/SPF/DKIM records, switch MX, and watch inbound flow move inside the TTL window. We run a 7-day overlap monitor so you can see when old-MX traffic has drained. The /migrate/google-workspace guide walks through the pattern; a Microsoft-specific variant is on the roadmap.
Is Folio enterprise-grade like Exchange Online?
- Folio is built on Amazon SES for outbound and a hardened Haraka inbound pipeline, with per-domain DKIM keys generated at RSA-2048, DMARC supported, and DynamoDB point-in-time recovery for mail data. We're not selling to Fortune 500 IT departments — we're a single-operator product. If your bar is Microsoft Purview compliance, Defender for Office 365, and tenant-wide DLP policies, you should stay on Exchange Online.
Sources & further reading
Where the claims come from.
Adjacent comparisons
Other head-to-heads.
Open the first letter
Two weeks of flat instead of per user.
Fourteen days of Folio, no charge. Keep your existing Microsoft 365 tenants running in parallel — they don't know we exist. Bind the same domains into Folio, route inbound here, and see whether one inbox and one flat price buys you more than what you'd lose by stepping away from Office. Cancel if it doesn't.
Updated 24 May 2026 (2026-05-24)