Best free way to migrate Exchange data from one tenant to another

This page summarizes the projects mentioned and recommended in the original post on /r/exchangeserver

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  • ImapSync

    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

  • It’s not really meant to move data from O365 to O365 but since O365 supports IMAP you probably can use it. https://imapsync.lamiral.info/. I used it to very successfully move mailboxes from postfix to O365. There is a free version that supports up to 3gb but if you can squeeze out €120, it’s well worth it.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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