[Dovecot] GUID Mismatch Issue

[Jeff Geiger]

Dovecot 2.1.7

While migrating mail from one server (Maildir) to another (mdbox), a config
issue caused my dsync to fail on a few accounts.  Those accounts received
mail on the new server over night and it autocreated new inboxes with new
GUIDs.  Now dsync wants nothing to do with mirroring between the two (diff
GUIDs).  Is there a way to fix this?

dsync(jeff at foo.bar): Error: Mailbox INBOX changed its GUID
(0eee4b021dcadd5158550000eed085a1 -> 43f87412a8f00352ac340000be821591)
dsync(jeff at foo.bar): Error: msg iteration failed: Couldn't open mailbox
0eee4b021dcadd5158550000eed085a1
dsync(jeff at foo.bar): Error: Mailbox INBOX changed its GUID
(0eee4b021dcadd5158550000eed085a1 -> 43f87412a8f00352ac340000be821591)
dsync(jeff at foo.bar): Error: Mailbox Trash changed its GUID
(0fee4b021dcadd5158550000eed085a1 -> 6300df050ef10352e9350000be821591)
dsync(jeff at foo.bar): Error: Mailbox Sent changed its GUID
(832d1e3663cadd515f5d0000eed085a1 -> 855ef505c0f00352fc340000be821591)

I need a way to merge the mailboxes, in either direction, so I can clear
out one side and successfully migrate the mail accounts.  Any tips or
pointers are greatly appreciated.