JustEmails vs Microsoft 365 for Business Email: Which Wins for Email-Only Teams?

Last Tuesday I got an email from a founder running a 20-person distributed team. Her Microsoft 365 bill had crept up to $1,440/year — $72/user/year on Business Basic, and half her team hadn't opened a Teams call in months. The other half used Slack. She was paying for a collaboration suite nobody was collaborating in.

That's the Microsoft 365 trap. You sign up for email, you get bundled with Teams, OneDrive, SharePoint, and a dozen features that sound useful on paper. The per-user pricing means every new hire adds another $6-12/month to a line item most finance teams never audit. And honestly? Most small businesses just need email that works.

We're the JustEmails team, part of Velocity Digital Labs. We also make ClickzProtect for ad fraud protection and VeloCalls for AI calling. (We wrote about our approach to building multiple SaaS products if you're curious.) The question we get weekly: "How do you compare to Microsoft 365?" So here's the real breakdown. Per-user math, what you lose, what you keep, and who should actually stay on M365.

Quick Verdict

TL;DR: JustEmails wins for email-only teams at 5+ users. Microsoft 365 wins if you actually use Teams, SharePoint, or need Exchange-specific features. If your team runs on Slack and Google Docs but you're stuck paying Microsoft for email, you're overpaying by $500-2,000/year depending on team size.

The decision is simpler than most comparison posts make it: Do you need Microsoft's productivity suite? Stay. Do you just need email? Leave. We've lost deals to Microsoft. It happens. Some teams genuinely need the full stack.

The Per-User Math That Nobody Runs

Microsoft 365 has three plans most small businesses consider. Here's what they actually cost as of May 2026:

Plan	Per-user/month	Annual (billed monthly)	What you get
Exchange Online Plan 1	$4.80 (annual) / $6 (monthly)	$57.60/user/year	Email only, 50 GB mailbox
Microsoft 365 Business Basic	$6/mo	$72/user/year	Email + Teams + 1 TB OneDrive
Microsoft 365 Business Standard	$12.50/mo	$150/user/year	Above + desktop Office apps

JustEmails charges per domain, not per user:

Plan	Price	Mailboxes	Storage
Solo	$9/mo	Up to 5	25 GB/mailbox
Business	$29/mo	Unlimited	50 GB/mailbox
Agency	$79/mo	Unlimited across 10 domains	50 GB/mailbox

Now the comparison everyone skips. We're using Exchange Online Plan 1 ($4.80/user annual, $57.60/year) and M365 Business Basic ($6/user, $72/year) since those are the two email-focused options most teams pick.

Team size	Exchange Plan 1 (annual)	M365 Business Basic	JustEmails Business	Annual savings vs Exchange	Annual savings vs M365 Basic
5 users	$288	$360	$348	-$60	$12
10 users	$576	$720	$348	$228	$372
15 users	$864	$1,080	$348	$516	$732
20 users	$1,152	$1,440	$348	$804	$1,092
50 users	$2,880	$3,600	$348	$2,532	$3,252

At 5 users, JustEmails is nearly break-even with Exchange Plan 1 and saves a bit versus Business Basic. Then? The gap explodes. A 20-person team saves $804-1,092/year. A 50-person team? Over $2,500 annually — enough to cover three months of an intern, or a year of Slack, or whatever else you'd rather spend money on.

The pricing model is the whole game. Microsoft charges you more for every person who needs an email address. JustEmails doesn't care if you have 6 users or 60.

Feature Comparison: What's Actually Different

Here's where I have to be honest about what you're giving up.

Feature	Microsoft 365 (Business Basic)	JustEmails
Custom domain email	Yes	Yes
Mailbox storage	50 GB	50 GB (Business plan)
IMAP / SMTP	Yes	Yes
Webmail	Outlook Web App (slick, honestly)	JustEmails webmail (clean, gets the job done)
Desktop client	Outlook (native)	Any IMAP client
Mobile app	Outlook iOS/Android (frustratingly good)	Mobile web + any IMAP client
Shared calendars	Yes (tight Exchange integration)	CalDAV (works, a bit clunky)
Teams video/chat	Yes	No
OneDrive storage	1 TB/user	No
SharePoint	Yes	No
Aliases / catch-all	Yes	Yes (unlimited)
SPF / DKIM / DMARC	Yes	Yes
Admin console	Microsoft 365 Admin Center	JustEmails dashboard
Support	Phone + chat (Business plans)	Email, 4-hour response target
Pricing model	Per-user	Per-domain flat

If you use Teams daily, Outlook's calendar sharing, or OneDrive for company files — Microsoft 365 is worth the per-user cost. That's not sarcasm. The integration between Outlook, Teams, and SharePoint works well when you're all-in on the Microsoft ecosystem. Really well, actually — I wish I could say otherwise.

But if your team uses Slack for chat, Notion or Google Docs for collaboration, and Zoom or Google Meet for calls? You're paying for a bundle you'll never unwrap.

Where Microsoft 365 Wins

Strong opinions require honest admissions. Here's where M365 is better. And yeah, it's a few things.

Outlook Is Best-in-Class Email Software

I don't love saying this, but Outlook — especially the new Outlook that shipped in late 2025 — is a damn good email client. Fast search, smart filtering, focused inbox that actually works. The mobile apps? Annoyingly good. Calendar integration is tight. (Yes, it pains me to admit this.)

JustEmails works with any IMAP client (Outlook included), but you lose Exchange-native features like automatic shared mailbox sync and calendar delegation. For teams that live in Outlook, this matters.

Teams Integration When You Actually Use It

If your company runs on Teams for everything — calls, chat, channels, file sharing — the single-sign-on between email and Teams is valuable. Scheduling a meeting from an email thread is one click. Screen sharing works. It's not that Slack or Zoom are worse; it's that the M365 bundle removes friction when you're fully committed.

Most of the businesses we talk to aren't fully committed. They picked M365 for email in 2019 and never adopted Teams because Slack was already entrenched. That's the pattern.

Enterprise Compliance Features

If you need litigation hold, eDiscovery, data loss prevention, or audit logging for compliance (healthcare, finance, legal) — Microsoft's enterprise tiers have you covered. JustEmails doesn't ship compliance tooling in 2026. We're focused on email that works, not email that satisfies SOX auditors.

Where JustEmails Wins

Now the flip side.

Predictable Cost That Doesn't Scale With Headcount

Your email bill shouldn't go up because you hired an operations coordinator. Every support@, careers@, billing@ mailbox is another $4.80-6/month on Microsoft. That's absurd pricing for a mailbox that receives 3 emails a week and forwards them to a real person.

JustEmails Business is $29/mo whether you have 4 mailboxes or 40. The pricing model fits how most businesses actually use email — lots of role accounts, a handful of power users.

Simpler Admin for Non-Technical Teams

The Microsoft 365 Admin Center is powerful. It's also designed for IT departments at 500-person companies. Adding a mailbox involves navigating licenses, exchange settings, and permission groups that don't mean anything to a 15-person startup without an IT person. I've watched founders burn 45 minutes trying to add a single shared mailbox. It's painful.

JustEmails: click "Add Mailbox," type the address and password, done. DNS verification shows green checkmarks when your SPF and DKIM are correct. It's designed for teams where the CEO is also the sysadmin. If you're evaluating other flat-rate options, our JustEmails vs MXroute comparison covers the differences.

No Bundle Tax

Microsoft 365 Business Basic includes Teams, OneDrive, and SharePoint whether you want them or not. Exchange Online Plan 1 is email-only, but it's still per-user and you lose some features (no mobile Outlook app without Business Basic or higher).

JustEmails is email. That's it. You're not subsidizing features you don't use. If you want cloud storage, pick Dropbox or Google Drive separately. If you want video calls, pick Zoom or Meet. Don't pay Microsoft $72/user/year for bundled tools that sit unused.

For email authentication setup (which both platforms need), our DMARC setup guide walks through getting from p=none to p=reject without breaking legitimate mail.

Who Should Pick What

Stay on Microsoft 365 if:

• Your team actually uses Teams for daily communication
• You rely on Outlook's shared calendars and booking features
• OneDrive/SharePoint is your company's file system
• You need enterprise compliance (eDiscovery, litigation hold, DLP)
• You have an IT department that already manages the Microsoft stack
• You're under 5 users and value the integrated suite

Switch to JustEmails if:

• You use Slack, Notion, or Google Docs — not the Microsoft productivity suite
• Most of your mailboxes are role accounts (support@, info@, sales@)
• You're over 5 users and email is your main M365 usage
• You want to stop paying per-user for something as basic as email
• You manage multiple domains and want flat-rate pricing across all of them

Run both if:

• A few power users need Outlook/Teams integration
• Most of the team just needs basic email
• You want to keep 2-3 Microsoft licenses for specific people while cutting the rest

That last option is what a lot of our customers do. The CFO keeps their M365 license because they live in Excel. Everyone else moves to JustEmails. Cuts the bill by 70%+ while keeping the people who actually need Microsoft on Microsoft.

Migration Isn't as Hard as Microsoft Wants You to Think

Quick version (we have a full custom domain email setup guide if you want the detailed walkthrough):

1. Export mail — Use Outlook's export or Microsoft's admin eDiscovery export to pull mailbox contents as PST files
2. Set up JustEmails — Create your domain, add mailboxes, configure DNS records per our dashboard
3. Import mail — Import PST via Thunderbird or any IMAP client to your new JustEmails mailboxes
4. Parallel run — Forward from M365 to JustEmails for 48 hours while both systems receive
5. Flip MX — Update your MX records to point at JustEmails
6. Cancel licenses — Downgrade or remove M365 licenses after 2 weeks of clean operation

The scary part is the MX cutover. It's actually a 5-minute DNS change. Set your TTL low 48 hours beforehand, update the MX, and propagation happens within the hour for most domains. We've botched this exactly once (our own domain, embarrassingly). Learn from our mistake: triple-check MX priority values.

Final Verdict

Microsoft 365 is a good product — when you use the whole bundle. The problem is most small businesses don't. They signed up for email, got a productivity suite, and kept paying for features they never adopted.

If your team runs on Slack and Google Docs, you're paying a Microsoft tax for brand recognition. A 20-person team on M365 Business Basic spends $1,440/year. JustEmails Business for the same team is $348/year. That's over $1,000 back in your budget, every year, forever.

For teams that live in the Microsoft ecosystem — Teams, SharePoint, the whole stack — stay where you are. The integration is worth the per-user cost.

For everyone else? Stop paying per-seat for email. It's 2026. Flat-rate exists. Use it.

Questions? Reach out at support@justemails.app. We respond within 4 hours and it's a real person — usually someone from the team who wrote this post. Check out our comparison with Google Workspace if you're evaluating multiple options, or explore pricing at JustEmails.

Frequently Asked Questions

Is Microsoft 365 Business Basic cheaper than JustEmails for small teams?

At 1-4 users, yes. Microsoft 365 Business Basic costs $6/user/month, so a 3-person team pays $18/mo vs JustEmails Business at $29/mo. The math flips at 5 users — M365 hits $30/mo while JustEmails stays at $29/mo. By 10 users, you're paying $60/mo for M365 vs $29/mo for JustEmails. The crossover point is exactly 5 seats, and most growing teams pass that within their first year.

What do I lose switching from Exchange Online to JustEmails?

Outlook's native desktop client, shared calendars with booking features, Microsoft Teams integration, and that excellent mobile Outlook app. You keep IMAP/SMTP access, custom domain mailboxes, unlimited aliases, SPF/DKIM/DMARC support, and webmail. If your team lives in Outlook and relies on shared calendar scheduling, switching is painful. If you just need to send and receive email, you won't notice the difference.

Can I use Outlook with JustEmails?

Yes, via IMAP/SMTP. Add your JustEmails mailbox to Outlook like any standard email account. You lose Exchange-specific features like shared mailboxes syncing automatically and calendar delegation, but basic email works fine. Most of our users connect through Apple Mail, Thunderbird, or the JustEmails webmail interface instead. For a deeper dive on choosing connection methods, see our SMTP vs API guide.

How does JustEmails handle a 20-person team compared to M365?

JustEmails Business is $29/mo flat for unlimited mailboxes on one domain. A 20-person team on Exchange Online Plan 1 pays $96/mo ($4.80 x 20 if annual, or $6 x 20 monthly). That's $67/mo difference, or $804/year. On M365 Business Basic at $6/user, the gap is $91/mo — over $1,000/year. The flat-rate model means adding your 21st employee doesn't touch the email budget.