This page is being rewritten!

Zextras OSE: https://www.zextras.com/zextras-build-based-on-zimbra-official-repository

First Steps: https://www.zextras.com/thankyou-zextras-build-zimbra/

Requirements: https://www.zimbra.com/documentation/

Migration Howto: https://community.zextras.com/zimbra-migration-with-zextras-backup

Install and update the latest supported Ubuntu Server OS (Ubuntu 20.04 LTS as of this writing).

apt install openssh-server net-tools wget

Get the latest Zimbra OSE installer from Zextras (as root):

cd ~
wget download.zextras.com/zcs-9.0.0_OSE_UBUNTU20_latest-zextras.tgz
tar -xzvf zcs-9.0.0_OSE_UBUNTU20_latest-zextras.tgz

Set the maximum message size on the Zimbra server before proceeding with any inbound migration to avoid problems.

Info below this point is old.

Zextras - Migrate to Network Edition:

https://zimbra.github.io/adminguide/latest/index.html#MIG-88-incremental-migration-with-backup-from-old-to-88

Zextras - Migrate to OSE:

https://wiki.zextras.com/wiki/ZxBackup:_Incremental_migration_with_ZeXtras_Backup

Change to the zimbra user for all commands:

su - zimbra

List the mailboxes to be exported:

zmprov gqu localhost | grep yourdomain.tld|awk {'print $1'}

or, for two domains:

zmprov gqu localhost | egrep 'yourdomain1.tld|yourdomain2.tld' | awk {'print $1'}

Count of the number of mailboxes to be exported:

zmprov gqu localhost | grep yourdomain.tld|awk {'print $1'} |wc -l

The following is an example script to export all mailboxes for one domain to a temporary location. Modify before using!:

• Host name
  • localhost is OK for single server installations
• Domain name
  • The target domain you want to export all mailboxes for
• Zimbra server URL
  • Omit -u and referenced URL for single server
• Destination
  • /tmp shown
  • Check for free space first!
• Uncomment lines after editing and testing to begin the export

vim /tmp/export-domain-all.sh

#!/bin/bash
for i in `zmprov gqu localhost | grep yourdomain.tld | awk {'print $1'}`; do
    echo $i
#    file=`echo $i | awk -F '@' '{print $1}'`
#    /opt/zimbra/bin/zmmailbox -z -t 0 -m "${i}" getRestURL -u "https://hoster.domain.tld" "//?fmt=tgz" > /tmp/${file}.tgz
done

chmod +x /tmp/export-domain-all.sh
/tmp/export-domain-all.sh

You can run this GUI tool as an administrator for Exchange server to Zimbra server migrations as well as PST imports.

The PC you run it from must have Outlook and .NET Framework 4 installed. Windows 10 comes with .Net Framework installed.

You will need to know the location of your PST file to use this tool.

1. Run the appropriate ZimbraMigration.exe to start the Wizard
   • 32-bit or 64-bit
   • Must match the Outlook installed
2. Choose User Migration
   1. Next
3. Click OK to select a .pst (Outlook data) file
4. Browse to and select a .pst file
   1. Next
5. Enter your Zimbra destination server and account details
   1. Hostname → zimbra.virtualarchitects.com
   2. Port → 443
   3. Use Secure Connection → Yes
   4. Username → Your e-mail address
   5. Password → Your Zimbra password
   6. Next
6. Select the items and options for your migration
   1. Choose Skip previously migrated items
   2. Click Migrate
   3. Check Verbose Logging for detailed log of any errors

Zimbra Admin → Tools and Migration → Download

See also Migrating to a New Mail Server

Merge Two Mailboxes: https://blog.grs.gr/language/en/how-to-merge-two-zimbra-mailboxes/

https://wiki.zimbra.com/wiki/Steps_to_export_a_folder_from_command_line_where_folder_name_contains_white_spaces

https://webhostinggeeks.com/howto/how-to-manage-mailbox-folder-using-zmmailbox-cli-in-zimbra/

su - zimbra

# Entire account
zmmailbox -z -m user1@domain.tld getRestURL "//?fmt=tgz" > /tmp/user1.tgz
# Folder and subfolders
zmmailbox -z -m user1@domain.tld getRestURL -o /tmp/user1.tgz '//?fmt=tgz&query=under:"Folder Name"'

zmmailbox -z -t 0 -m user2@domain.tld postRestURL "//?fmt=tgz&resolve=modify" /tmp/user1.tgz

zmmailbox -z -t 0 -m user2@domain.tld postRestURL "//?fmt=tgz&resolve=reset" /tmp/user1.tgz

This tool appears to require Outlook 2010 (or older?) installed on the machine you are using to run the Migration Wizard.

This tool allows for migration from Outlook (PST) to Zimbra.

Zimbra Admin → Tools and Migration → Download

See also Migrating to a New Mail Server

Read this entire page first: Migrate Using Zextras Backup

If you are migrating from one Zimbra ZCS server to another, this is the way to go. It is fairly simple and very effective.

• Accounts
• CoS
• Mail
• Calendar Items
• Briefcase Items
• Drive Items
• Preferences
• Etc.

1. Ensure that Zextras Backup is installed on both the source and destination servers
   • You can configure Zextras Backup on the destination server permanently
2. Disable Zextras Backup Realtime Scanner on both servers
3. Disable scheduled SmartScans on both servers
4. Mount the backup media on the source server
   • Set permissions to zimbra:zimbra
   • Usually /opt/zimbra/backup/zextras
5. Run a Zextras Backup SmartScan backup on the old server
   • Initializing Zextras Backup will run a SmartScan
   • May take hours
   • Do not run another Zextras Baackup (SmartScan) on the source server until you are ready for the final cutover
6. Dismount the backup media from the source server
7. Mount the backup media on the destination server
   • Use a temporary mount point such as /mnt/tmp
   • Reset the permissions to zimbra:zimbra
8. Start the restore
   • Use multiple threads for a quicker restore
   • May take days
9. Dismount the backup media from the destination server
10. Mount the migration backup media back on the source server
    • Use exactly the same mount point previously used
    • Reset the permissions to zimbra:zimbra
11. When you want to do the actual migration, stop mail flow on port 25
    • Verify the mail has stopped flowing
    • Incoming mail will be delayed
12. Run another (final) SmartScan on the source server
    • It won't take long as it's an incremental backup
13. Dismount the migration backup media from the source server
14. Mount the migration backup media on the destination server
    • Use a temporary mount point such as /mnt/tmp
    • Reset the permissions to zimbra:zimbra
15. Start the restore
    • Use multiple threads for a quicker restore
    • This restore will be much quicker
    • May still take hours depending on how much mail has flowed since the first pass
16. Dismount the migration backup media from the destination server
17. Enable Zextras Backup Realtime Scanner on the destination server
18. Enable scheduled SmartScans on the destination server

http://www.mojocode.com/content/moving-domain-multi-domain-zimbra-server

Let's say you are migrating a domain off of your multi-domain Zimbra server, but you don't want to just delete the accounts immediately…

If you edit the domain status to closed, users can't log in and the server won't route mail for the domain…which is a problem. Users of other domains on that server will not be able to send mail to the 'closed' domain.

So, you can easily rename the domain and the server will then route mail normally to the migrated domain.

su - zimbra

zmprov --ldap rd mydomain.com mydomain-old.com