Comparison
SuperMailOS vs Microsoft 365
Microsoft 365 is what most companies already run — Word, Excel, Teams, and Exchange Online in one per-seat subscription. If your org genuinely uses the Office bundle, it's often the cheapest way to buy all of it at once. The question this page answers: what if you only need great business email?
| Microsoft 365 | SuperMailOS | |
|---|---|---|
| Pricing model | Per user per month, tiered by desktop apps + storage | Per mailbox: Pro $4/mo ($3 annual, 3 domains), Business $6/mo ($5 annual, unlimited domains) |
| What you’re buying | Office apps + Teams + Exchange email | Business email only — inbox, aliases, IMAP/SMTP, deliverability |
| Aliases | Distribution lists/shared mailboxes; licensing rules apply per human reader | Unlimited, free, every domain |
| Multiple domains | Accepted domains on the tenant; admin-managed | Core product: every domain in one inbox, independently authenticated |
| Deliverability | Exchange infrastructure; DKIM/DMARC/SPF largely DIY in Defender/admin portals | Managed end to end, live dashboard |
Where Microsoft 365 wins
- The bundle is the value. Desktop Office + Teams + OneDrive at business pricing is hard to assemble separately for less — if people actually use them.
- Enterprise everything. Compliance, eDiscovery, legal hold, conditional access — the admin surface is enormous and mature.
- Everyone knows Outlook/Teams. Zero onboarding friction in Microsoft-native orgs.
Where SuperMailOS wins
- Email without the bundle tax. Seats that only need email ( support, ops, contractors ) cost $4–6, not an Office license.
- Aliases that don't need a licensing meeting. Unlimited free role addresses on every domain, delivering into real inboxes.
- Multi-domain by design. Every product's mail in one inbox with per-domain authentication and deliverability — not tenant accepted-domain sprawl.
- Deliverability operated. Records from the mail server's zone, DMARC parsing, warmup and reputation managed, visible per domain.
Which one fits you
Company lives in Excel and Teams: 365, no contest. Email-heavy operations, many domains, or seats that never open Office: the per-mailbox math favors SuperMailOS quickly — see the plans.
FAQ
Does SuperMailOS work with Outlook?
Yes — standard IMAP/SMTP. Connect Outlook or any client; the managed deliverability is on the sending infrastructure side.
Can I run both — 365 for the office, SuperMailOS for products?
A common pattern: keep 365 for suite users, put product/support domains on SuperMailOS. Each domain's mail lives where it fits, with authentication handled on ours.
What about shared mailboxes?
The alias model covers most shared-mailbox needs — a role address delivering into a real inbox a person reads — without per-seat licensing rules.
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