Exchange Online Plan 1: Pricing, Features and When to Use It (2026)

Choosing an email licence for Microsoft 365 looks simple until you meet the plan list. Exchange Online Plan 1 is Microsoft’s entry-level business email subscription, and it looks a lot like several other plans, which is why people pay for the wrong one. This guide sets out what you get, what you pay and where the licence fits.

It is written for the admin who has to choose. You will find the prices, the 50 GB mailbox, the differences with Plan 2 and the PowerShell to assign a seat, and by the end you will know whether this plan, Business Basic or Plan 2 suits your team.

🎯 What is Exchange Online Plan 1?

Exchange Online Plan 1 is a standalone, cloud-hosted business email licence. Each user gets a 50 GB mailbox, a 50 GB archive mailbox, a calendar, contacts and access to shared mailboxes, with no on-premises server. Microsoft runs and patches the service under a 99.9% uptime commitment.

“Standalone” means you buy it on its own, without the Office apps or Teams. That makes it cheaper than a Microsoft 365 bundle, and it does one job: secure company email on your own domain.

You will also see it called Exchange Online (Plan 1) or Office 365 Exchange email. On a vendor quote or in Microsoft Graph, the line item “EXCHANGESTANDARD” is this exact licence.

💷 Exchange Online Plan 1 pricing

Exchange Online Plan 1 costs about $4 per user per month on an annual commitment. A month-to-month term costs about 20% more. Microsoft revises list prices from time to time, so check the current figure before you sign.

Compared with the bundles, the email-only seat is the cheapest way to give someone a mailbox. Business Basic costs more because it adds Teams, SharePoint, OneDrive and the web Office apps. Plan 2 costs more again: it doubles the mailbox and adds compliance tools. A team that needs none of those extras saves money every month.

Licences are per user: 25 staff means 25 seats. An annual term locks the lower rate for 12 months, which suits a stable headcount.

📦 What Exchange Online Plan 1 includes

Each user gets a 50 GB mailbox and email on your own domain. Shared mailboxes cover team addresses like sales or support, and calendars, contacts and distribution lists are standard. A small company can run all of its mail from day one.

Security is included. Exchange Online Protection filters spam and malware on every message, and modern authentication protects each sign-in. Users reach their mail in Outlook, a browser or a phone, since mobile sync works out of the box. Microsoft pays service credits when uptime drops below 99.9% in a month.

The plan stops at email and calendars by design. The Office desktop apps, Teams and SharePoint come with other licences, as the next sections show.

⚖️ Exchange Online Plan 1 vs Plan 2

Both plans deliver the same email service on the same platform. Plan 2 adds headroom and compliance tools for larger or regulated teams; Plan 1 stays lean.

The four real differences

Four things separate the two plans. Storage: 50 GB on Plan 1, 100 GB on Plan 2. Archiving: Plan 1 includes a 50 GB archive mailbox, while Plan 2’s archive expands automatically up to 1.5 TB. Data-loss prevention runs on Plan 2 only, and so does litigation hold.

The choice comes down to compliance rather than daily features. A marketing team rarely needs litigation hold, so Plan 1 fits. A law firm or a clinic usually does, since regulators expect retained mail. The rules you must meet decide it more often than storage.

🤝 Does Exchange Online Plan 1 include Teams?

No, and this is the most common misunderstanding we see. Exchange Online Plan 1 covers email, calendars and contacts only. Microsoft Teams, the desktop Office apps, SharePoint and OneDrive come with the Microsoft 365 bundles, such as Business Basic or Business Standard.

The mix-up is understandable: many people use “Office 365” to mean everything Microsoft sells. Staff who need chat, video meetings or shared document libraries will be short with an email-only seat.

🆚 Exchange Online Plan 1 vs Business Basic

These two are compared more than any other pair, and the gap is wider than the price suggests. Business Basic costs a few dollars more per user and adds Teams, SharePoint, OneDrive and the browser Office apps. The real question is whether you want email alone or a collaboration suite.

Teams that already collaborate elsewhere still pick the email-only seat: a shop on Google Docs, or one that meets in Zoom, may want only mail from Microsoft. For most others the bundle wins, because the extra tools cost little and nobody has to glue services together later.

📨 Mailbox size and message limits

Plan 1’s limits are generous for everyday email. A 50 GB mailbox holds years of mail for most people. The message size limit is 35 MB by default and an admin can raise it to 150 MB, so large attachments still go through.

Sending limits protect the service from abuse. A mailbox can send to 10,000 recipients a day, 500 per message and 30 messages a minute. That is plenty for business email; newsletters and bulk alerts belong on a dedicated sending service.

One ceiling deserves a flag. Plan 1’s archive stays at 50 GB and never expands, so a user who keeps every message can eventually fill both the mailbox and the archive. Most users never get close, and Plan 2 or the Exchange Online Archiving add-on removes the ceiling for those who do.

🌐 Custom domain support

The plan supports your own domain in full: addresses like name@yourcompany.com rather than a Microsoft suffix. It also accepts several domains in one tenant, which suits a business with two brands.

Add and verify the domain in the admin center, then publish the MX, SPF and DKIM records at your DNS host; they route and authenticate your mail. Each mailbox can then take the new address. PowerShell makes the checks quick.

# Connect to Exchange Online first
Connect-ExchangeOnline -UserPrincipalName admin@contoso.com

# List the domains your tenant already accepts
Get-AcceptedDomain | Select-Object Name, DomainName, DomainType

# Confirm a user's primary address uses your custom domain
Get-Mailbox -Identity sara@contoso.com | Select PrimarySmtpAddress

With correct DNS records, delivery just works. A missing SPF or DKIM entry sends mail to spam folders, and checking both after setup prevents most early delivery complaints.

📎 Shared mailboxes, aliases, and groups

Shared mailboxes cost nothing extra. A team works one address like sales@ or support@ together, and a shared mailbox stays free as long as it stays under 50 GB and nobody signs in to it directly. A small firm can run several team inboxes without buying a seat for each.

Aliases give one person several addresses, such as a role name beside their own, all landing in the same inbox. Distribution groups send one address to many people, which suits announcements or department lists. All of it ships with the plan.

Map your team’s patterns before you buy seats. A busy support desk often needs one licensed agent and a free shared mailbox, not five paid boxes.

🛒 How to buy and assign Exchange Online Plan 1

Buying the plan takes minutes, direct or through a partner. In the Microsoft 365 admin center, add the licences under Billing and assign one to each user. A partner or reseller can do the same for you, often on friendlier terms.

For many seats at once, PowerShell beats clicking: check how many licences the tenant owns, then assign them in one command. In Microsoft Graph the licence appears as “EXCHANGESTANDARD”.

# See which licences your tenant owns and how many seats are free
Connect-MgGraph -Scopes "Organization.Read.All","User.ReadWrite.All"
Get-MgSubscribedSku |
  Select SkuPartNumber, @{N='Free';E={$_.PrepaidUnits.Enabled - $_.ConsumedUnits}}

# Assign Exchange Online (Plan 1) to a user
$sku = Get-MgSubscribedSku | Where-Object SkuPartNumber -eq 'EXCHANGESTANDARD'
Set-MgUserLicense -UserId sara@contoso.com -AddLicenses @{SkuId=$sku.SkuId} -RemoveLicenses @()

The mailbox appears a few minutes after the assignment, and the user can sign in at Outlook on the web. For a batch of new starters, loop the command over a CSV and fifty people are onboarded in one script.

🧭 How to activate Exchange Online Plan 1

Once a user has the licence, the mailbox provisions itself. Activation is a first sign-in: the user opens Outlook on the web, signs in with the work account, and the inbox appears within a minute.

On first run the user sets a time zone, adds a signature and registers for multi-factor authentication if the tenant asks. Outlook on the desktop finds the account through Autodiscover, with no manual server settings, and phones connect the same way through the built-in mail app.

Admins can confirm the result with one command. Get-Mailbox -Identity sara@contoso.com shows the mailbox, its database and its primary address. If it is not there yet, wait a few minutes: provisioning sometimes lags the licence.

📥 Move your existing email to Exchange Online Plan 1

Most buyers already have mail somewhere: an old web host, Google Workspace or an on-premises Exchange server. Each source has a clean route that keeps every message, so plan the move before you switch any address.

Three paths cover almost every case. An IMAP migration pulls mail from nearly any provider and suits small teams. A cutover migration moves an on-premises Exchange organization of up to 2,000 mailboxes, though Microsoft recommends it for 150 or fewer; larger or longer moves use a hybrid deployment. For a handful of users, importing PST files by hand works too.

Order matters. Create the new mailboxes, then run the migration batch with New-MigrationBatch while the old system still receives mail. Switch the MX record to Microsoft only after the copy finishes. Users keep working throughout and nothing bounces.

🗄️ Archiving and adding more space

Exchange Online Plan 1 gives a 50 GB mailbox and a 50 GB archive mailbox, neither of which expands. That covers most users for years. A heavy sender can fill both, and the fix is a licence change, not a setting.

When space runs tight you have two clean options: prune old mail with retention policies, or move that user to Plan 2 for an archive that grows to 1.5 TB. Check archive status first and upgrade only the mailboxes that need it. PowerShell reports the state quickly.

# Plan 1 has no auto-expanding archive - check the archive state in bulk
Get-EXOMailbox -ResultSize Unlimited |
  Select DisplayName, ArchiveStatus

# Plan 1 mailboxes report ArchiveStatus = None.
# After you move a user to Plan 2, enable the archive:
Enable-Mailbox -Identity sara@contoso.com -Archive

Archiving is a per-user decision, not a tenant-wide one. Most people stay well under 50 GB, and one Plan 2 seat covers the rare user who keeps every thread.

🔐 Security and compliance limits

The plan secures mail well but draws a clear compliance line. Exchange Online Protection scans every message for spam and malware, and modern authentication protects each sign-in. Data-loss prevention, litigation hold and the wider governance tools come with Plan 2 and the compliance suites.

Know the gaps before an auditor finds them. Plan 1 has retention policies but no data-loss prevention and no litigation hold. A regulated business usually needs at least one of those and should size up to Plan 2; a team without that duty is well served by Plan 1.

👥 Who should choose Exchange Online Plan 1

This plan fits a few clear profiles. Frontline and deskless staff need mail but rarely open Office apps. An email-only small business fits too, especially one that already collaborates in other tools.

It also works beside richer plans. A service account, a contractor or a role inbox that needs sign-in rarely needs Teams or Office, and one cheap seat covers it. Mixing plans this way lowers the average cost per user across the tenant.

Some teams should skip it. Staff who need chat, meetings or shared files are better served by Business Basic, and a business under strict compliance rules by Plan 2. A cheap seat that blocks daily work is no bargain.

🔁 How to upgrade from Plan 1 to Plan 2

Upgrading is painless. You can move one user or a whole group from Plan 1 to Plan 2 with no mailbox migration: the mailbox stays where it is and the licence swap unlocks the larger mailbox and the compliance tools. There is no downtime and no data move.

# Swap Exchange Online (Plan 1) for (Plan 2) on one user, no migration
$p1 = (Get-MgSubscribedSku | Where-Object SkuPartNumber -eq 'EXCHANGESTANDARD').SkuId
$p2 = (Get-MgSubscribedSku | Where-Object SkuPartNumber -eq 'EXCHANGEENTERPRISE').SkuId

Set-MgUserLicense -UserId sara@contoso.com -AddLicenses @{SkuId=$p2} -RemoveLicenses @($p1)

After the swap, enable auto-expanding archiving and turn on the policies you need. The user notices only more headroom, since the address and the mail stay put. Running Plan 1 by default and lifting only the seats that outgrow it keeps spending tied to real demand.

✅ Exchange Online Plan 1: a quick decision checklist

Before you commit, run your needs through this checklist. It covers the questions that decide the plan in practice and catches both the over-buy and the under-buy.

1. Do your users need only email and calendars? If yes, this plan fits.
2. Will they need Teams, SharePoint, or the Office apps? If yes, choose Business Basic.
3. Do you face retention, archive, or DLP rules? If yes, choose Plan 2.
4. Is a 50 GB mailbox enough for the next few years? Confirm before you buy.
5. Do you bill annually for a stable headcount? That locks the lowest price.

Microsoft lists every limit in its Exchange Online service description. The numbers change as the service evolves, so check that page before sizing a licence.

💡 Common Exchange Online Plan 1 mistakes to avoid

Two buying errors come up every month. One is over-buying: a full suite when a 50 GB mailbox would do. The other is the reverse: an email-only seat for staff who need Teams on day one.

Two technical slips also cost time. Forgotten SPF and DKIM records send mail to spam, and an ignored archive ceiling surfaces only when a mailbox is full. A five-minute check of both at setup prevents the support ticket later.

Match the plan to the work, set the DNS records correctly and keep an eye on mailbox size. Done that way, Exchange Online Plan 1 covers what most small teams need at the lowest price in the range.

📚 More for IT Admins

❓ Exchange Online Plan 1: Frequently Asked Questions