Microsoft Outlook vs Zimbra (2026): which should you pick?

Microsoft Outlook

• People who want mail, calendar and contacts from several accounts in one app
• Organizations already paying for Microsoft 365 and Exchange email
• Windows users: Microsoft says Outlook is included free with Windows

Zimbra

• Companies and schools that need to keep email on servers they control
• Hosting providers offering white-labeled email to customers
• Teams moving off Microsoft Exchange who want Outlook compatibility

Microsoft Outlook

• Free accounts show ads in the inbox; a Microsoft 365 Basic, Personal or Family subscription removes them.
• Business Basic has only web and mobile Outlook. Apps for business ($10.00) adds desktop Outlook without business email; Business Standard with Copilot ($23.50) has both.
• On home plans, Copilot in Outlook currently works only with outlook.com, hotmail.com, live.com and msn.com addresses, and only for the subscription owner.
• Microsoft lists Outlook for Windows, macOS, iOS, Android and the web. No Linux app is listed.

Zimbra

• Pricing is not published; Zimbra is licensed, and renewals go through an account manager.
• The FAQ calls the Open Source Edition end of life, with no updates or support.
• Features such as backup and restore, Zimbra Office and large-scale mobile sync need the commercial license.
• Chat and real-time collaboration are protected in transit only, not end-to-end encrypted.

Microsoft Outlook

Several accounts in one app

The desktop and mobile apps take Outlook.com, Gmail, Yahoo, iCloud and other mail services alongside work or school accounts, and switch between them without leaving the app.

Focused Inbox, Sweep and snooze

Focused Inbox and Sweep clear clutter out of the main view. Messages can be snoozed until later or flagged as important.

Calendar, contacts and to-do lists

Email, calendars, contacts and to-do lists sit in one view. Outlook can schedule events, set reminders, and track packages and flights on supported platforms.

Copilot in Outlook

Drafts a message from a prompt, adjusts tone, length and clarity, and summarizes long threads. Included with Microsoft 365 Personal and Family, with usage limits.

Mailbox protection

Outlook scans attachments and links for threats on Microsoft email addresses. Paid plans add mailbox encryption, checks on suspicious links and removal of dangerous attachments.

Office files from the inbox

Open, edit or send Word, Excel and PowerPoint documents from the inbox, and attach OneDrive files as links.

Zimbra

Mail, calendar and contacts

A web client with advanced and attachment search, personal and global address lists, group and resource scheduling, and tasks.

Two editions

Zimbra Daffodil (v10) needs a license, sold as Professional or Standard. Professional has additional features over Standard.

Desktop and mobile access

Zimbra Desktop for Windows, macOS and Linux, a Connector for Outlook on Windows, and ActiveSync on iOS and Android.

Standards-based clients

Works with IMAP, POP, CalDAV and CardDAV, so Thunderbird, Apple Mail and similar clients can connect.

Security and admin controls

Built-in anti-spam and antivirus, two-factor sign-in, LDAP or Active Directory, SAML sign-in and delegated administration.

Deployment options

Install on your own servers, run it in the cloud on AWS or OCI, or use a hosting partner, with multiple domains per install.

Microsoft Outlook

• Outlook$0

  For 1 person: email and calendar on web, desktop and mobile, 15 GB of mailbox storage, 5 GB of cloud storage and core spam filtering, with ads.

• Microsoft 365 Basic$1.99

  per month, or $19.99 per year

  For 1 person: ad-free Outlook, 100 GB of mailbox storage, 100 GB of cloud storage and advanced Outlook security features.

• Business Basic$7.00

  per user / month, paid yearly ($5.40 without Teams)

  Custom business email on Exchange for up to 300 users, with the web and mobile versions of Outlook only and 1 TB of cloud storage per user.

• Microsoft 365 Personal$9.99

  per month, or $99.99 per year

  For 1 person on up to 5 devices at once: the Outlook desktop app with Copilot, 1 TB of cloud storage and Microsoft Defender.

• Microsoft 365 Family$12.99

  per month, or $129.99 per year

  The Personal benefits for 1 to 6 people, who share 2 TB of cloud storage between them. AI features are for the subscription owner only.

• Business Standard with Copilot$23.50

  per user / month, paid yearly ($20.30 without Teams)

  Adds desktop versions of Outlook and the other Office apps, plus Copilot grounded in work data. Business Premium with Copilot is $32.00.

Zimbra

Pricing could not be confirmed. See zimbra.com.

Microsoft Outlook

• Annual discount

  About 16% lower with yearly billing

  Paying yearly costs $19.99 for Microsoft 365 Basic, $99.99 for Personal and $129.99 for Family, against $1.99, $9.99 and $12.99 a month.

• Education

  Students save 50% on Microsoft 365 Personal

  College and university students who verify their status get 50% off Microsoft 365 Personal, which includes the Outlook desktop app with Copilot. Eligibility is re-verified each year.

• Nonprofit

  Business Basic free for eligible nonprofits

  Microsoft lists Business Basic as a grant, free for up to 300 users. Nonprofit staff pricing is $3.50 per user / month for Business Standard and $5.50 for Business Premium, paid yearly.

Zimbra

No public discounts listed.