Zimbra

What Zimbra does

Zimbra is an open-source email and collaboration platform owned and operated by Synacor, Inc. (NASDAQ: SYNC) and headquartered in the United States. Founded in 2003 (operating since 2005), the company provides email, calendar, contacts, tasks, file-sharing (Briefcase), chat, and in-browser document collaboration through a single suite. The platform is built on open standards (SMTP, IMAP, CalDAV, CardDAV, ActiveSync, EWS) with an extensibility layer called Zimlets, and supports deployment from 10 users to 10 million on-premises, in private cloud, or in regional data centers — a positioning the company uses to address data sovereignty, GDPR, and HIPAA requirements for highly regulated buyers. Two commercial editions (Standard and Professional) are sold on annual subscriptions, augmented by tiered support (Standard, Premier, Elite) and professional services such as training, upgrades, and implementation. The company historically acquired Mezeo Software (2014) and was itself acquired by Synacor in 2017 after a prior acquisition by Yahoo in 2007.

Zimbra distributes almost entirely through a channel model of more than 3,000 VARs and Business Service Providers (BSPs) across 127 countries, supplemented by direct website engagement (60-day free trial, quote requests, web client). The customer base spans over 6,000 organizations including highly regulated institutions in finance, government, and education — with reference deployments such as Université de Lorraine (110,000 mailboxes), PT Kereta Api Indonesia (28,000+ employees), and Bank CCB Indonesia. Recent strategic emphasis is on sovereign cloud expansion in EMEA and APAC, where the company is targeting the $80 billion Gartner-forecast opportunity through new executive leadership (Anthony Chadd as CRO, March 2026), regional partner buildout, and partnership wins with state-owned enterprises. The platform serves approximately 101-250 employees globally, with engineering operations in Pune and Bangalore, India, and is supported by active open-source community forums and a wiki-based documentation ecosystem.

Name

Zimbra

Legal name

Synacor, Inc.

Website

https://zimbra.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

101–250 employees

Short description

Zimbra is an open-source email and collaboration platform (owned by Synacor) serving 6,000+ organizations across 127 countries, including government, financial, and education customers needing data sovereignty and on-premises deployment as an alternative to Microsoft and Google.

Ownership category

akta.pro rank

Product category

Enterprise Email and Collaboration Software

NAICS

Custom Computer Programming Services (541511)

SIC

Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Custom Application Development (Web/Mobile/Desktop) (BPAEAFAA)

Keywords

• Email collaboration platform
• Open source email server
• Enterprise messaging software
• Data sovereignty solutions
• Secure email and calendaring

Headquarters

HQ city

Palo Alto

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Marketing or Sales, Infrastructure, Operations

Revenue model

1. Commercial Software Licenses: Zimbra's core server is open-source, with advanced features such as high-availability clustering, encryption, large-scale sync, and enterprise functionality available through commercial licensing. Two main editions: Standard and Professional, with the Professional tier offering expanded features including Outlook integration, mobile push, and archiving.
2. Support and Maintenance: Annual support contracts with different tiers: Standard (business-hours support) and Premier (24x7 for Severity-1 issues plus business-hours support). Elite tier offers prioritized organizational relationship with additional packaged support services.
3. Professional Services: Training services (public courses, certified training partners), upgrade and tuning services, and implementation assistance. Available through Synacor professional services team and certified partners.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels8 records

Core offering

Zimbra is an open-source email and collaboration platform that provides email, calendar, contacts, tasks, file-sharing (Briefcase), chat, and in-browser office document collaboration for organizations of all sizes. The platform is available in a free Open Source Edition and a commercial Network Edition (Standard and Professional tiers) with deployment flexibility across on-premises, private cloud, or regional data centers. It is sold primarily through a global channel partner network of 3,000+ Value Added Resellers and Business Service Providers serving highly regulated enterprises, governments, and educational institutions.

Product overview

Zimbra is an open-source email and collaboration platform available as both a free Open Source Edition and a commercial Network Edition. The core Zimbra Collaboration Suite (ZCS) provides email, calendar, contacts, tasks, file management (Briefcase), document creation (Zimbra Office), and messaging (Zimbra Chat). The platform differentiates through data sovereignty, offering on-premises, private cloud, or regional data center deployment options. Key add-ons include Zimbra Connector for Outlook (ZCO) for Microsoft Outlook integration, Zimbra Desktop for offline access, and Zimlets for extensible third-party integrations including Salesforce, Zoom, Slack, and Dropbox. Access is available via web client, mobile ActiveSync, and desktop clients, with deployment scale from 10 users to 10 million across 6,000+ organizations in 127 countries.

Differentiator

Problem solved

Functional benefit

Products and services

• Zimbra Collaboration Suite (ZCS) Open-source email and collaboration platform providing email, calendar, contacts, tasks, chat, and file management with data sovereignty and deployment flexibility. Available in Open Source Edition and commercial Network Edition tiers for organizations from 10 to 10 million users.
• Zimbra Open Source Edition Free open-source edition of Zimbra offering core email, calendar, contacts, and collaboration features for self-hosted deployments; advanced enterprise features require a commercial license.
• Zimbra Network Edition (Standard and Professional commercial licenses) Commercial edition of Zimbra providing full access to all enterprise features including high-availability clustering, advanced encryption, large-scale sync, Outlook integration, mobile push, and commercial support. Available in Standard and Professional tiers on annual subscription.
• Zimbra Connector for Outlook (ZCO) Microsoft Outlook integration plug-in for Windows providing synchronized email, calendar, global address lists, and OAuth2 authentication for Outlook users connecting to Zimbra.
• Zimbra Desktop Offline desktop email client for Windows and Mac providing full access to Zimbra email, calendar, and contacts when connectivity is limited, with PST import and auto-archive capabilities.

Quantifiable outcome

• 50% decrease in total cost of ownership and savings of more than $230,000 over five years for Indonesian conglomerate Gunung Sewu switching from competitors
• +1 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration10 records

Feature9 records

Partnerships

Seven partnerships are on record, tiered major, core and regional.

• PT Kereta Api Indonesia (PT KAI)majorStrategic or Co-development Partner · 28 August 2025Zimbra partnered with PT KAI (Kereta Api Indonesia), Indonesia's state-owned railway operator, to upgrade PT KAI's legacy email platform with Zimbra Network Edition. This partnership provides PT KAI full control over its communications infrastructure, ensures data security and compliance, and improves system reliability across PT KAI's national network serving more than 28,000 employees. The partnership highlights growing awareness among Indonesian public institutions around digital self-reliance as regulators stress the need for in-country data storage.
• Optimiza SeguridadcoreChannel Partner/ Reseller/ Distributor · 16 March 2021Optimiza Seguridad became a Zimbra BSP Partner with exclusive representation of Zimbra to the Chilean Government. The company provides experience in management and development for government customers in Chile.
• AZTi (Accops and Zevoke Technology, Inc.)majorChannel Partner/ Reseller/ Distributor · 1 August 2019AZTi partnered with Zimbra to launch ZCC (Zimbra Collaboration Cloud), a collaboration service powered by Zimbra targeted for Japan's business customers. AZTi combines Zimbra with application security products to provide an all-in-one security solution for Japanese enterprise customers. The service targets around 10,000 mailbox prospects with a goal of 100,000+ by Q1 2021. Partners include NEC, Marubeni Information Systems, and other major Japanese companies.
• CloudiancecoreChannel Partner/ Reseller/ DistributorCloudiance is a business service provider partner delivering Zimbra solutions globally. They use Zimbra as the best available tool to deliver a profitable, scalable, reliable, personalized, and open-source alternative to Google and Microsoft.
• CloudmatikaregionalChannel Partner/ Reseller/ DistributorRegional partner in Indonesia providing Zimbra deployment and support services.
• IIJ (Internet Initiative Japan)regionalChannel Partner/ Reseller/ DistributorRegional partner in Japan providing Zimbra deployment and managed services.
• InnovaregionalChannel Partner/ Reseller/ DistributorRegional partner providing Zimbra services.

Scale indicators12 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• IceWarp: Email and collaboration server provider offering on-premises and cloud deployments with similar feature set (email, calendar, chat, file sharing) to Zimbra. Competes in mid-market and enterprise segments with comparable pricing model.
• Open-Xchange: Open-source email and collaboration platform (OX App Suite) serving ISPs, telcos, and hosting providers globally. Closest direct competitor to Zimbra with similar open-source heritage, channel-based distribution, and target customer segments.
• Nextcloud: Open-source collaboration platform offering email (via integration), file sharing, calendar, chat, and office productivity. Competes with Zimbra in the sovereign, on-premises, and privacy-focused enterprise and government segments.

Emerging players

• BlueMind: Open-source email and collaboration platform from France, focused on data sovereignty and European customers (government, education, healthcare). Direct overlap with Zimbra's sovereign cloud thesis and target verticals in EMEA.
• Proton Mail / Proton Workspace: End-to-end encrypted email and growing productivity suite based in Switzerland, targeting privacy-conscious businesses and consumers. Competes with Zimbra in data sovereignty and security-focused segments, though with a different deployment model.
• Kolab Now / Kolab Enterprise: Open-source groupware and email provider targeting privacy-conscious European enterprises and SMEs. Overlaps with Zimbra in open-source, sovereign cloud positioning, though smaller scale and narrower feature set.
• Axigen: Email and collaboration platform for ISPs, hosting providers, and enterprises, with both on-premises and cloud offerings. Comparable to Zimbra in target customer base (service providers, mid-market) and Linux-based architecture.

Broad incumbents

• HCL Domino (formerly IBM Notes): Legacy enterprise email and collaboration platform still deployed in many large organizations and governments. Competes with Zimbra in on-premises email modernization and migration scenarios, particularly in financial services and government.
• Google Workspace: Cloud-native productivity and email suite (Gmail, Calendar, Drive, Meet) targeting the same enterprise and education segments as Zimbra. Zimbra positions itself as the sovereign and cost-effective alternative to Google Workspace.
• Microsoft Exchange Online / Microsoft 365: The dominant enterprise email and collaboration platform with Exchange Online, Outlook, Teams, and Microsoft 365. Directly competes with Zimbra for enterprise email deployments, but bundles productivity, AI, and identity services that Zimbra does not offer.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/zimbra
• GitHubgithub.com/Zimbra
• YouTubeyoutube.com/c/zimbra
• Facebookfacebook.com/zimbra
• LinkedInlinkedin.com/company/synacor

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds3 records

Investors6 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Zimbra