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Zimbra alternatives: 6 apps ranked by verified data

Facts checked Oct 29, 2026AppBreakup editorialHow we rank

Common reasons people leave Zimbra: pricing is quote-only; no public price list for the commercial editions, and running and patching your own mail server takes real admin time and skill. We ranked 6 alternatives by how directly each one replaces Zimbra, then by reviews, real visits and how recently each app's facts were checked against its own website. Microsoft 365 currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Roundcube logoRoundcubeOpen sourceYesWeb, Self-hosted4 of 457.5
2Nextcloud logoNextcloudOpen sourceYesWeb, Windows, macOS +44 of 451.2
  1. Roundcube logo

    1. RoundcubeTop pick

    Best for: Admins and hosts who need a free browser-based client for their own mail server

    Open sourceSelf-hostableWeb, Self-hosted

    57.5

    score / 100

    Why switch from Zimbra

    Free open-source webmail you can put in front of any IMAP server you already run.

    Pros

    • Free, open source and widely bundled by web hosts
    • Plugin API, LDAP address books and PGP support
    • Responsive interface works on phones

    Cons

    • Needs your own server and IMAP backend
    • Less polished than commercial webmail
    • Frequent security updates to keep up with
    Visit Roundcube Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Roundcube a good Zimbra alternative?

    Verified facts

    4 of 4 verified
    License
    GPL-3.0
    Checked Oct 29, 2026github.com(opens source in a new tab)
    Type
    Browser-based IMAP client
    Checked Oct 29, 2026roundcube.net(opens source in a new tab)
    Encryption
    PGP support
    Checked Oct 29, 2026roundcube.net(opens source in a new tab)
    Extensions
    Plug-in API
    Checked Oct 29, 2026roundcube.net(opens source in a new tab)
  2. Nextcloud logo

    2. Nextcloud

    Best for: Organisations and tinkerers who want Google Drive features on their own server

    Open sourceSelf-hostableWeb, Windows, macOS, Linux, iOS, Android, Self-hosted

    51.2

    score / 100

    Why switch from Zimbra

    Self-hosted and open source too, with files, calendar and groupware apps on your own hardware.

    Pros

    • Free, open source and fully self-hostable
    • Large app ecosystem beyond files
    • Data stays wherever you choose to run it

    Cons

    • You handle updates, backups and performance
    • Can feel slow on modest hardware
    • Quality varies across community apps
    Visit Nextcloud Details and reviews
    How this score is calculated
    Editorial fit ×0.341
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Nextcloud a good Zimbra alternative?

    Verified facts

    4 of 4 verified
    Open source
    Yes
    Checked Oct 29, 2026nextcloud.com(opens source in a new tab)
    Self-hosting
    Yes
    Checked Oct 29, 2026nextcloud.com(opens source in a new tab)
    Enterprise price
    From €71.29 per user/year (100 users)
    Checked Oct 29, 2026nextcloud.com(opens source in a new tab)
    Client apps
    Free
    Checked Oct 29, 2026nextcloud.com(opens source in a new tab)

The best Zimbra alternative for…

The highest-ranked app in this list for each need.

Microsoft 365 logo

Best Zimbra alternative for most people

Microsoft 365

Hosted Exchange mail plus Office apps, for teams ready to give up running their own server.

Roundcube logo

Best Zimbra alternative for a free option

Roundcube

Free open-source webmail you can put in front of any IMAP server you already run.

Zoho Mail logo

Best Zimbra alternative for a free plan you can upgrade

Zoho Mail

Hosted business email with calendar and files, at lower cost than the big two suites.

Nextcloud logo

Best Zimbra alternative for open source

Nextcloud

Self-hosted and open source too, with files, calendar and groupware apps on your own hardware.

Roundcube logo

Best Zimbra alternative for self-hosting

Roundcube

Free open-source webmail you can put in front of any IMAP server you already run.

Microsoft 365 logo

Best Zimbra alternative for Mac

Microsoft 365

Hosted Exchange mail plus Office apps, for teams ready to give up running their own server.

Microsoft 365 logo

Best Zimbra alternative for Windows

Microsoft 365

Hosted Exchange mail plus Office apps, for teams ready to give up running their own server.

Zoho Mail logo

Best Zimbra alternative for Linux

Zoho Mail

Hosted business email with calendar and files, at lower cost than the big two suites.

Go

Best Zimbra alternative for iPhone and Android

Google Workspace

Fully hosted Gmail, Calendar and Drive with no servers to maintain.

mailbox.org logo

Best Zimbra alternative for working in the browser

mailbox.org

German-hosted, privacy-focused business mail and calendar if you want EU hosting without self-hosting.

Zimbra alternatives: common questions

What is the best alternative to Zimbra?

Microsoft 365 ranks first right now. Hosted Exchange mail plus Office apps, for teams ready to give up running their own server. Google Workspace and Zoho Mail follow it in our ranking.

Is there a free alternative to Zimbra?

Yes. Microsoft 365 (free plan + paid), Zoho Mail (free plan + paid), Roundcube (open source) and Nextcloud (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Zimbra?

Yes: Roundcube and Nextcloud. Roundcube and Nextcloud can also be self-hosted.

Which Zimbra alternatives work on Linux?

Zoho Mail and Nextcloud run on Linux.

Why do people switch from Zimbra?

The complaints we hear most: pricing is quote-only; no public price list for the commercial editions; running and patching your own mail server takes real admin time and skill; outlook support, mobile push and archiving need the higher Professional edition.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Zimbra, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.