mccb

mccb (Mail Contact Calendrier Bridge) migrates mail, calendars, contacts and tasks from one place to another, from a web dashboard. It is built for batches of mailboxes and for very large sources (resumable uploads, a drop folder, a command line).

• Sources: Outlook PST and OST files, mbox, Maildir, .eml, .msg, .ics, .vcf and zip files, IMAP, CalDAV, CardDAV, Exchange on premises, Exchange Online (Microsoft 365), JMAP and Google.
• Targets: IMAP, CalDAV, CardDAV, Exchange on premises, Exchange Online and JMAP. By default a mailbox writes to the IMAP and DAV server it belongs to.

Start here:

• Install mccb with Docker Compose and sign in.
• Migrate a mailbox: add a server, add mailboxes, pick a source, run.
• Connectors and Protocols and file formats: what each source and target moves.
• Pause, resume and retry: how an interrupted import continues without duplicates.
• Repair a damaged mailbox: broken accents, attachments and signature images left by another tool.
• Command line and API tokens, Server-side intake and Notifications: work without watching a browser.

mccb is MIT licensed, with no paid edition. Exchange, Microsoft 365 and Google were tested against simulated servers only. Read Known limitations before relying on it.