A bit of searching produces this useful PHP routine, which almost worked. Two tweaks got it all the way there:
- force the correct time zone
- quote the write-mode parameter in fopen
The changes, with line numbers in parens (line 347 was line 345 before the first change, OK?):
76: // force timezone
347: $this->mboxhnd = fopen($this->mboxfn,'w');
After that, run the script as directed to convert the entire maildir tree in one fell swoop.
cp -a /from-wherever/Mail/ /tmp
php maildir2mbox.php Mail
The output files appear in the mboxfiles directory adjacent to the top-level maildir directory. Don’t use the -e parameter, which would add a .mbox suffix to each file.
Evolution’s import “feature” is a major pain, as you must import the converted files One. MBOX. File. At. A. Time. Sheesh.
Rather than that, just slide the whole mboxfiles structure into place. Some case changes were in order for my setup, which may be due to historic considerations:
- sent-mail -> Sent
- Spam (will become Junk in Evo)
- Templates (not that I use any)
Then put the mboxfiles directory somewhere on the NFS server and fiddle the Evolution directory structure:
cp -ap mboxfiles /mnt/nfs-place/mail/
mv local local.base
ln -s /mnt/nfs-place/mail/ local
Evolution will build all its indexes when it first sees the new files, so it’s all good.