Emcognito WebMail vs. Microsoft 365
Microsoft 365 is priced for teams.
You are one operator.
Microsoft 365 prices Outlook per user, per tenant — every additional business under your operator-of-one needs its own tenant at $6+/month, with its own admin console and bill. Emcognito WebMail is single-operator and flat: one subscription covers unlimited bound domains, with per-domain DKIM and automatic reply From. For five domains the published Microsoft 365 Business Basic rate works out to about $30/month; Emcognito Solo is $2.99/month annual.
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. It's a credible bundle when there are users in the plural.
When the operator is one human running multiple businesses, the per-user pricing model is the wrong shape. Emcognito is $2.99/month flat across unlimited domains. 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's per-user pricing and single-tenant domain model make you pay for users you don't have to get an inbox shaped like the work you actually do.
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$18.00 / month (3 tenants × $6)$2.99 / month
- Price for 1 user, 10 domains$60.00 / month$2.99 / month
- Multi-domain reading modelSeparate tenants — separate Outlook inboxesOne 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 per tenant (one per domain, in practice)One
- 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.
Emcognito is not a replacement for that bundle. If you live in Excel, keep Microsoft 365 — and route your secondary domains through Emcognito for the per-identity reply behaviour 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 single-tenant trap for multi-domain operators.
Microsoft 365 supports up to five accepted domains per tenant on most business plans. That sounds generous until you realise all five domains share the same user licenses, the same admin posture, and the same primary identity. Replies don't auto-pick the From by inbound domain across tenants; users don't separate by domain visually; the entire tenant reads as one organisation.
The standard workaround for a true multi-business operator is one tenant per business — which means one $6/month per user license per business, plus one admin console per business, plus separate Stripe invoices for each. At three businesses, that's $216/year for software still designed around one operator.
Emcognito inverts the multiplication. One operator, one flat price, unlimited bound domains, automatic reply From by inbound identity.
V · A deeper look
The admin-console tax, itemised.
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.
Emcognito collapses that into one admin surface. One DNS wizard per bound domain, one billing page, one suppression list, one support channel. Less software to manage and fewer places for a misconfiguration to live.
VI · The arithmetic, per month (1 user)
The numbers, in US dollars.
| Domains you run | Microsoft 365 Business Basic | Emcognito (annual) | You keep |
|---|---|---|---|
| 1 | $6.00 | $2.99 | $3.01 |
| 3 | $18.00 | $2.99 | $15.01 |
| 5 | $30.00 | $2.99 | $27.01 |
| 10 | $60.00 | $2.99 | $57.01 |
| 15 | $90.00 | $2.99 | $87.01 |
Common questions
Questions readers ask.
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's per-user, per-tenant model multiplies cost and admin overhead with each domain. Emcognito WebMail is $2.99/month annual on Solo (up to 3 domains) or $12/month annual on Studio (unlimited). 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. The harder problem is at the tenant level: replies don't auto-pick From by inbound domain across separate tenants, and the per-tenant license cost stacks fast for a multi-business operator. The DKIM mechanics work; the pricing 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 Emcognito 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. Emcognito 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 Emcognito for the per-identity reply behaviour.
How does the migration from Exchange Online to Emcognito work?
- It's a DNS cutover per domain. Lower the MX TTLs ahead of time, publish Emcognito'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 Emcognito enterprise-grade like Exchange Online?
- Emcognito 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 Emcognito, no charge. Keep your existing Microsoft 365 tenants running in parallel — they don't know we exist. Bind the same domains into Emcognito, 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)