Importing Mail mailboxes to new iMac, preserving hierarchy

Transferring hundreds of mailboxes? I have about 600 mailboxes on my older iMac that I need to move to my new Tahoe iMac. Apple instructions are incomplete and don't help. I've already "exported" all those mailboxes to an external hard drive. Now, how do I import dozens (or more) mailboxes at one time and protect the hierarchy of their organization?

iPhone 8, iOS 16

Posted on Aug 2, 2026 3:23 PM

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7 replies

Aug 6, 2026 3:09 PM in response to koeller

Yes, that's exactly the informations I was looking for.


You will need a USB-C to Ethernet adapter (connect the USB-C end to the iMac 2024) and an Ethernet cable (between the adapter and the mid-2015 iMac; the mid-2015 iMac has an Ethernet port on the back).


The wired transfer between Mac will be faster and more stable than using a Wi-Fi connection.

Importing Mail mailboxes to new iMac, preserving hierarchy

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