Preparation
Inform users about the migration timelines and recommend backing up their email files.
Introduce users to the new email hosting platform and provide guidance on how to use webmail.
Lower the time-to-live (TTL) value to less than an hour on the domain DNS zone records. (Required)
Ensure that the same users exist on both email platforms. If you have a large number of accounts, you can use the bulk tool to create users in the OpenSRS Control Panel.
Pre-Migration
Watch the complete email migration walkthrough video in preparation for the migration.
Configure defaults for branding and default company preferences, including account limits, language and mailbox sizes.
Update webmail settings to match your branding requirements, including logos and colors as well as access to optional features.
Stop provisioning new email accounts until migration is completed.
Stop allowing password changes for email accounts.
Extract the existing address books and calendars on behalf of each user and save them as a vCard file.
Inform your users well in advance that they shouldn’t make any changes to their address books or calendars after you extract the data.
Send each user their vCard files, with instructions on how to save the file and how to import contacts in OpenSRS webmail once migration is complete.
Migration
Change the DNS on the domains to point to OpenSRS email servers.
Use the email migration tool to migrate user mail over IMAP or POP.
Post-Migration
Notify users when migration is complete.