Possible options for large number of user accounts

• ImapSync

  134 3,185 2.9 Perl

  Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is

  

For the migration of old emails, Mailcheap has a (couple of options)[https://www.mailcheap.co/help/nms/migration/] or you could use (imapsync)[https://imapsync.lamiral.info/] with any of them. I just don't know what's the best approach to do a batch transfer for thousands of users, and you also need to consider calendar and contacts.

• groupoffice

  4 169 9.9 PHP

  Group Office groupware and CRM

  

In terms of running your own server with Activesync; obviously there is Microsoft Exchange, possibly Open-Xchange too (it isn't free), but you could deploy your own Zimbra server (a few options, they have open source but you need a bolt on for ActiveSync) or there is Group Office, which is open source and supports ActiveSync: https://www.group-office.com/

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

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