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Be careful with which Exchange servers you try offlineimap with. There was a severely bad interaction in Exchange with how offlineimap operates. Exchange used a global database with a small limit (I want to say 2^16) for unique message headers. Offlineimap injected unique headers for synchronization purposes. This quickly led to resource exhaustion and essentially blocked the server.



each email is supposed to have a globally unique Message-Id header, offlineimap or not.


No, this was a unique header name, X-offlineimap-????; not a value. My understanding is the DB table was a list of unique header names.




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