Univik Migration Services

Kerio Email Migration Services

✓ Kerio Connect Expert All Versions Supported Zero Downtime 100% Data Integrity
Excellent 4.9 (156 Reviews)

Univik provides professional Kerio email migration services for businesses moving away from Kerio Connect or Kerio MailServer. We migrate to Microsoft 365, Google Workspace, Exchange, Zimbra and other platforms with zero downtime and complete data integrity.

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  • All Kerio Products: Kerio Connect, Kerio MailServer, GFI Kerio Connect - all versions supported.
  • All Data Types: Emails, attachments, contacts, calendars, tasks, notes and distribution lists.
  • All Destinations: Microsoft 365, Google Workspace, Exchange, Zimbra, Zoho and more.
From the open Kerio store to the cloud. .eml .eml .eml Your Kerio store Migrate Microsoft 365 or Google Workspace An open store makes an honest migration. Every file accounted for.

Migration Destinations

500+

Kerio Migrations

50K+

Mailboxes Migrated

100%

Data Integrity

2013

Since

✓ Kerio Connect Expert
✓ Zero Downtime
✓ 100% Data Integrity
✓ All Versions
✓ 500+ Migrations

Kerio Products

Supported Kerio Products

We migrate from all versions of Kerio Connect and Kerio MailServer - on-premises, hosted or cloud.

Kerio Connect

All Versions

  • ✓ Kerio Connect 9.x (Latest)
  • ✓ Kerio Connect 8.x
  • ✓ Kerio Connect 7.x
  • ✓ GFI Kerio Connect
  • ✓ On-Premises Install
  • ✓ Kerio Cloud Hosted

Kerio MailServer

Legacy Versions

  • ✓ Kerio MailServer 6.x
  • ✓ Kerio MailServer 5.x
  • ✓ Older Legacy Versions
  • ✓ Windows Server Install
  • ✓ Linux Server Install
  • ✓ Mac Server Install

Data Store Access

Multiple Methods

  • ✓ IMAP Protocol
  • ✓ Kerio API Access
  • ✓ Direct Store Access
  • ✓ Backup File Import
  • ✓ EML/MBOX Export
  • ✓ PST Conversion

Migration Destinations

Migrate Kerio to Any Platform

Pick the destination. The Kerio side of the job stays the same either way.

Microsoft 365

Exchange Online, Outlook

Business BasicBusiness StandardEnterprise

Google Workspace

Gmail, Google Calendar

Business StarterBusiness PlusEnterprise

Exchange Server

On-Premises Exchange

Exchange 2019Exchange 2016Exchange 2013

Other Platforms

Zimbra, Zoho and More

ZimbraZoho MailKerio Upgrade

File Format Exports

Export Kerio mailboxes to standard file formats for archival or import elsewhere.

PST (Outlook)MBOXEML FilesMSG FilesvCard (.vcf)iCal (.ics)

Kerio to Kerio

Migrate between Kerio installations for upgrades, consolidation or server moves.

Server UpgradeDomain MergeConsolidationCloud MoveHardware Refresh

Data Migration

What Data We Migrate

The whole account makes the trip: mail, folders, contacts, calendars and public folders, counted at both ends.

Emails

All Messages & Folders

  • ✓ All email messages
  • ✓ Complete folder structure
  • ✓ All attachments
  • ✓ Sent/Drafts/Trash
  • ✓ Read/unread status

Contacts

Personal & Shared

  • ✓ Personal contacts
  • ✓ Contact groups
  • ✓ Distribution lists
  • ✓ Global address book
  • ✓ Contact photos

Calendars

Events & Scheduling

  • ✓ All calendar events
  • ✓ Recurring events
  • ✓ Meeting invitations
  • ✓ Shared calendars
  • ✓ Reminders & alarms

Tasks

To-Do & Assignments

  • ✓ Personal tasks
  • ✓ Task assignments
  • ✓ Due dates & priority
  • ✓ Task categories
  • ✓ Completion status

Notes

Personal Notes

  • ✓ All notes
  • ✓ Note categories
  • ✓ Rich text formatting
  • ✓ Creation dates
  • ✓ Color labels

Metadata

Properties & Flags

  • ✓ Message flags
  • ✓ Read/unread status
  • ✓ Date/time stamps
  • ✓ Categories/labels
  • ✓ Importance/priority

Migration Scenarios

Common Migration Scenarios

Why businesses migrate from Kerio and how we help with each situation.

Cloud Adoption

Moving from on-premises Kerio to Microsoft 365 or Google Workspace for better collaboration and reduced maintenance.

Remote WorkNo HardwareAuto Updates

Cost Reduction

Kerio licensing costs increasing or looking for more cost-effective alternatives with better features.

License SavingsNo Server CostsPredictable Pricing

End of Support

Legacy Kerio MailServer no longer supported or updated. Need to migrate to maintained platform.

Security UpdatesComplianceModern Features

Merger/Acquisition

Consolidating email systems after company merger. Need to unify Kerio with parent company's platform.

Domain MergeUser ConsolidationSingle Platform

Growth & Scale

Business outgrowing Kerio capabilities. Need enterprise features like advanced compliance and eDiscovery.

EnterpriseComplianceAdvanced Security

Server Upgrade

Upgrading Kerio to newer version or moving to new server hardware. Clean migration preferred over in-place upgrade.

Version UpgradeHardware RefreshClean Install

 A Rare Advantage

The Open Store Is Your Exit Ticket

Kerio Connect keeps every message as a plain .eml file on disk. Few mail servers give you that. It changes what a migration can promise.

One file per message

The store lives at store/mail/domain/user/folder inside a #msgs directory, one .eml per item. There is no proprietary container to crack open before mail can move.

Even contacts are .eml

GFI's own documentation confirms contacts sit in the store as .eml files carrying vCard data. Calendars and tasks follow the same open pattern, which keeps them recoverable file by file.

Verification you can count

Because each item is a file, the source has an exact item count before migration starts. Our completion report compares that number against the destination, mailbox by mailbox.

A dead server does not end a Kerio migration. As long as the store directory can be copied off the disk, the mailboxes inside it can still reach Microsoft 365 or Google Workspace.

 Read the Direction

GFI's Free Tools Point Into Kerio, Never Out

Admins often assume the vendor toolbox covers leaving. For Kerio, every shipped tool moves data toward the product.

ToolDirectionWhat that means for your exit
Kerio Exchange Migration Tool (KEMT)Exchange into KerioBuilt for arrivals. It reads Exchange through MAPI and writes into Kerio mailboxes. It has no reverse gear.
Kerio IMAP Migration Tool (KIMT)IMAP servers into KerioSame story: an intake tool. Useful history if you once migrated in, useless for the trip out.
KMSRecoverBackup into the storeA restore utility. It replaces store content with backup content rather than merging, which matters if you plan to consolidate before migrating.
The store itselfOut, by designThe .eml files on disk are the outbound path GFI never had to build. Copy the store and every message travels with headers, attachments and folder placement intact.

Our service works from either end: a live server over IMAP with delta passes or a copied store when the server is already down.

 From the GFI Knowledge Base

Store Handling Rules Worth Knowing

Four cautions from Kerio's own documentation that decide whether a store-level migration goes smoothly.

Stop the server before touching the store

GFI's guidance is firm: Kerio Connect must not be running while files are added or copied at store level. A live server rewrites indexes underneath you and clients resync half-moved folders.

Dropped-in mail needs a reindex

Placing .eml files into #msgs makes them exist on disk, not in mailboxes. The Web Admin reindex is what makes the server notice them. Counts taken before reindexing mislead.

KMSRecover replaces, it does not merge

Pointing a restore at a store you have been consolidating overwrites the consolidation. Restores come first, merges come second and the migration reads the final result.

The archive ZIPs hold more history

Kerio's archiving feature writes compressed ZIP archives of the same .eml content. Companies migrating for compliance often need those archives moved too. Say so at assessment and they get their own line in the quote.

 Straight Answer

When a Migration Service Is Overkill

Some Kerio exits are small enough to handle in-house. Here is where the line sits in the projects we see.

A few mailboxes, mail only

Five accounts with no public folders can walk to a new platform over IMAP in an afternoon. Save the budget.

A copied store plus a converter

Holding the store directory already? A desktop EML converter turns it into PST or any format you need, licensed once. We will point you to the right one instead of quoting a project.

Kerio is staying

Kerio Connect remains an active GFI product with current releases. If it serves you and the licensing works, keeping it patched is a plan and nobody needs to migrate anything.

What moves the line: public folders, resource scheduling, archives and headcount. Two of those together usually justify handing the project over.

 Feature Mapping

Where Kerio Features Land After the Move

Kerio concepts and their destination equivalents, decided and documented before cutover rather than discovered after.

Public folders

They become shared mailboxes or Microsoft 365 groups on one side or shared drives on Google. Access lists are rebuilt and each folder owner confirms theirs before go-live.

Resources and rooms

Kerio resource scheduling maps to room and equipment mailboxes with booking policies recreated, so the Tuesday meeting still finds its projector.

Aliases and domains

Every alias and secondary domain is inventoried from the server config and recreated at the destination before MX changes, so no address stops receiving.

Mailing lists

Kerio mailing lists turn into distribution groups with membership carried over. Moderated lists get their moderation settings mapped where the destination supports them.

Archives

Archive ZIP content lands in destination archive mailboxes or a searchable archive tier, keeping retention obligations intact through the move.

Server-side rules

Kerio filters do not import into Outlook or Gmail. Each user receives their rule list as a checklist, which takes minutes to recreate and saves weeks of confusion.

Your Concerns

Addressing Your Migration Concerns

Common questions and concerns about migrating from Kerio.

"Will there be downtime?"

Minimal to Zero. We perform initial migration while Kerio is running. Final cutover with delta sync takes minutes. Users may not even notice the switch.

"Will I lose any data?"

100% Data Integrity. We migrate all emails, contacts, calendars, tasks and notes. Folder structure preserved. We verify data counts before and after migration.

"How much does it cost?"

$15 per mailbox to start. The rate falls with volume, the quote is fixed after the free assessment and payment lands only after the migration verifies.

"How long will it take?"

Size decides. A 50-mailbox office is a 3-day job, a 200-seat company takes about a week and big estates get a staged plan. After-hours slots exist for the switch itself.

"Do users need to do anything?"

Minimal User Involvement. We handle all technical migration. Users just need to reconfigure email clients after cutover - we provide instructions.

"Is our data secure during migration?"

TLS end to end. An NDA is on offer before a byte moves and our working copies are wiped once your counts check out.

How It Works

Our Migration Process

A proven 6-step process that delivers a clean Kerio migration with minimal disruption.

Assessment

We analyze your Kerio environment - version, mailbox count, data volume and special requirements. Free assessment with detailed migration plan.

Planning

The schedule gets dates, the destination tenant gets configured and every public folder, resource and alias gets a line in the inventory before anything moves.

Pre-Migration

Initial bulk migration while Kerio remains active. Most data transferred during this phase with zero user impact.

Verification

Verify data integrity - compare mailbox counts, folder counts and random sampling. Identify and resolve any issues.

Delta Sync

Final sync to catch any new emails since pre-migration. Quick process - typically minutes. MX records updated.

Cutover & Support

DNS cutover to new platform. User communication and client configuration support. Post-migration monitoring.

Typical Migration Timeline

1-3 Days

1-50 Mailboxes

3-7 Days

50-200 Mailboxes

1-2 Weeks

200+ Mailboxes

Minutes

Final Cutover

Pricing

Migration Pricing

Transparent per-mailbox pricing with volume discounts. Free assessment included.

Small

$15

Per mailbox

  • ✓ 1-25 mailboxes
  • ✓ Emails & attachments
  • ✓ Contacts & calendars
  • ✓ Basic support
  • ✓ 1-2 day turnaround
Chat With a Migration Engineer

Standard

$12

Per mailbox

  • ✓ 26-100 mailboxes
  • ✓ Full data migration
  • ✓ Delta sync included
  • ✓ Priority support
  • ✓ 2-5 day turnaround
Get Quote

Business

$10

Per mailbox

  • ✓ 101-500 mailboxes
  • ✓ Public folders
  • ✓ Shared mailboxes
  • ✓ After-hours work
  • ✓ Dedicated engineer
Get Quote

Enterprise

Custom

Contact for quote

  • ✓ 500+ mailboxes
  • ✓ Multi-domain
  • ✓ Complex environments
  • ✓ Custom requirements
  • ✓ Project manager
Contact Us

What is Included

Per-mailbox pricing that already includes the delta passes, the verification report and the support afterwards. The number on the quote is the number on the invoice.

FAQ

Frequently Asked Questions

Answers to common questions about Kerio email migration.

We migrate from all Kerio email products including Kerio Connect (all versions 7.x, 8.x, 9.x), Kerio MailServer (legacy versions 5.x, 6.x) and GFI Kerio Connect. We support migrations from on-premises installations, hosted Kerio environments and Kerio Cloud.

We migrate Kerio to Microsoft 365 (Exchange Online), Google Workspace (Gmail), Exchange Server (on-premises 2013-2019), Zimbra, Zoho Mail and other IMAP-compatible platforms. We also support Kerio-to-Kerio migrations for upgrades or server consolidation, plus export to PST/MBOX/EML files.

Everything a mailbox holds: messages with their attachments, the whole folder tree, personal and shared contacts, calendars with recurring meetings intact, tasks, notes and mailing lists. Read state, flags, categories and timestamps travel along with the mail.

Mailbox count sets the pace. Up to 50 mailboxes usually wrap inside 3 days, a 50 to 200 fleet takes most of a week and larger estates run as a staged fortnight. The cutover delta itself is a matter of minutes and weekend slots are available for the switch.

Close to none. The heavy copying happens while Kerio keeps serving mail as usual. On cutover day one delta pass sweeps the recent arrivals in minutes and the MX record swings to the new platform. For most staff the whole event is Monday morning trivia.

Pricing starts at $15 per mailbox for small migrations. Volume discounts: $12/mailbox (26-100), $10/mailbox (101-500), custom pricing for 500+. Includes all data types, delta sync, verification and support. Free assessment provided - no obligation.

Yes. We migrate shared mailboxes, resource mailboxes (rooms/equipment), public folders and distribution lists. Permissions may need to be reconfigured on the destination platform depending on capability differences between Kerio and target system.

Typically yes - we need admin-level access to efficiently migrate all mailboxes. Options include: Kerio admin API access, IMAP access with admin credentials or direct access to Kerio data store (for server-to-server migration). We can also work with per-user IMAP access if needed.

Yes. If your Kerio server is no longer running, we can migrate from Kerio backup files or direct access to the Kerio data store directory. We can extract and migrate mailbox data without a running Kerio instance. Just provide the backup files.

During pre-migration phase, email continues flowing to Kerio normally. After MX cutover, new email goes to the destination. Delta sync captures any emails that arrived between pre-migration and cutover. No email is lost during the transition.

For migrations to cloud platforms (M365, Google Workspace), users will have new credentials in the destination system. Kerio passwords cannot be migrated. We can help coordinate password distribution and support users during transition. For some platforms, SSO integration is possible.

Yes. We can filter migration by date range - for example, only emails from the last 2 years. This reduces migration time and destination storage needs. Useful for compliance or when older data is archived elsewhere.

Leave the server powered but read-only for a few weeks as a reference shelf. When the counts are confirmed and nobody has needed to look anything up, switch it off. Nothing on it was changed or removed by us at any point.

Yes. Transfers run over TLS, an NDA can be signed before anything moves and working copies are wiped once you confirm the counts. The job needs headers, counts and folder structure. Nobody here reads message content.

Yes. We can assist with Microsoft 365 or Google Workspace tenant setup, domain verification, user provisioning and initial configuration. We can also help with DNS changes and client configuration guidance. Full turnkey service available.

A Kerio migration service moves complete mailboxes from a Kerio Connect server, whether on-premises, partner-hosted or Kerio Cloud, into a new platform such as Microsoft 365 or Google Workspace. The work covers mail, contacts, calendars, tasks, public folders, resources and aliases, runs delta passes so nothing sent mid-project is lost and ends with a per-mailbox count report. It differs from a converter tool in that people plan, run and verify the move for you.

Count the moving parts. A tool handles a small number of mailboxes well when someone in-house has the time and the store or IMAP access is simple. The service earns its fee when public folders, resource scheduling, archives, aliases across domains or hundreds of mailboxes enter the picture, because those are the parts that fail quietly in tool-only runs. Our assessment tells you which side of the line you are on and we say so honestly either way.

Success Stories

Kerio Migration Case Studies

Real Kerio migration projects we have completed for businesses.

Kerio → M365 2024

Law Firm Cloud Migration

75-user law firm migrating from Kerio Connect 9 to Microsoft 365 Business Premium for better collaboration and remote access.

75

Mailboxes

180GB

Data

3 Days

Completed

Result: Zero downtime migration completed over weekend. All emails, contacts and calendars migrated perfectly.

Kerio → Google 2024

Marketing Agency

Creative agency moving from legacy Kerio MailServer to Google Workspace for better integration with Google Drive and collaborative tools.

45

Mailboxes

95GB

Data

2 Days

Completed

Result: Smooth migration with all 8 years of email history preserved. Team productive on day one.

Kerio → Exchange 2024

Manufacturing Company

Manufacturing firm migrating from Kerio Connect to on-premises Exchange 2019 to integrate with existing Microsoft infrastructure.

220

Mailboxes

450GB

Data

10 Days

Completed

Result: Complex migration including shared mailboxes and public folders. Cutover during maintenance window.

Consolidation 2024

Post-Acquisition Merge

Acquired company's Kerio server consolidated into parent company's Microsoft 365 tenant. Multiple domains unified.

130

Mailboxes

3

Domains

5 Days

Completed

Result: Smooth domain merge. Users from both companies now on unified platform.

Kerio Upgrade 2024

Server Hardware Refresh

Healthcare organization upgrading from old Kerio server on aging hardware to new Kerio Connect installation on modern infrastructure.

85

Mailboxes

200GB

Data

2 Days

Completed

Result: Clean migration preferred over in-place upgrade. All data migrated, fresh server configuration.

Archive Export 2024

Compliance Archive

Financial services firm exporting all Kerio mailboxes to PST files for long-term compliance archival before decommissioning server.

150

Mailboxes

800GB

Data

4 Days

Completed

Result: All mailboxes exported to individual PST files with folder structure intact for regulatory retention.

Reviews

What Clients Say

MR

Michael Roberts

IT Director, Law Firm

"We were dreading the Kerio to Office 365 migration but Univik made it painless. Zero downtime, all our emails and contacts migrated perfectly. The team was responsive and professional throughout."

Verified
SB

Sandra Brown

Office Manager, Agency

"Migrating from Kerio MailServer to Google Workspace could have been a nightmare. Univik handled everything - even 8 years of email history. Our team was up and running on Gmail with no data loss."

Verified
JT

James Thompson

CTO, Manufacturing

"220 mailboxes migrated from Kerio to Exchange 2019 with minimal disruption. Univik did the heavy lifting over the weekend. Their team knew Kerio inside and out. Highly recommend for any Kerio migration."

Verified

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Ready to Migrate From Kerio?

Tell us your mailbox count and your destination. A concrete quote comes back within 24 hours.

Free Assessment Call Expert
✓ Free Assessment ✓ Zero Downtime ✓ 100% Data Integrity ✓ From $15/mailbox

About Univik

Univik is an email migration and digital forensics company founded in 2013.

With 12+ years experience and 500+ successful Kerio migrations, we have helped businesses of all sizes move from Kerio Connect and MailServer to modern platforms. Our team includes certified migration specialists with deep expertise in Kerio architecture and major destination platforms. We serve clients in 89+ countries.

Kerio Migration Experts

500+ Kerio Migrations

12+

Years

500+

Kerio Migrations

50K+

Mailboxes

89+

Countries

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