Possible options for large number of user accounts

1. ImapSync

   1 143 3,675 2.6 Shell

   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.

2. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

3. groupoffice

   2 4 228 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/

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