Hi Steven,

Don't be too concerned about the underlying mechanism of the Mailboxes
folder. There are many explanations for all of this.

In the case of the Mailboxes folders, multi-part MIME messages are
stored across multiple files (one file for each part). Multi-part MIME
messages are probably the majority of messages on the internet these
days. So your Mailboxes folder contains 290 Parts, not 290 Messages.

Also don't worry about the discrepancy in megabytes. It is normal.
Firstly, each emlx file has some metadata appended to it, so it is
slightly larger than the server size. Moreover, many e-mail parts are
smaller than the "allocation block size" (physical block size) of
modern hard disks, so there is space wasted. Mac will report the true
physical allocation size AND the logical byte size of the data
contained within the files, whereas servers will usually report only
the logical byte size (which is smaller than the physical allocation
size).

But I realise this doesn't help you solve your problem. To here's how
to make Apple Mail import your imapmbox. Firstly, copy your
INBOX.imapbox from backup (or Library folder) to your Desktop. COPY
it, do not try to import the original to itself or you could create a
loop. Then rename the copy from INBOX.imapmbox to INBOX.mbox. You can
now import it into Mail and delete the COPY. The imported messages
will appear in an 'Import' folder under the heading of 'On My Mac'.
You can then move the messages to your IMAP folder. The reason for
this trickery is that Apple Mail only imports LOCAL mailboxes, so you
need make it interpret the cached IMAP (server) folder as a LOCAL
folder even though it is actually a cached IMAP (server) folder.

James


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