Sure, I just wasn't sure if that's what you were looking for. It looks something like this:
user to be migrated: email@example.com
admin user: firstname.lastname@example.org
Note: "mysecret" and "myothersecret" are the admin passwords, not the users' passwords
imapsync --syncinternaldates --server1 server1.domain.com --user1 email@example.com --authuser1 firstname.lastname@example.org --password1 mysecret --server2 server2.domain.com --user2 email@example.com --authuser2 firstname.lastname@example.org --password2 myothersecret
(Make sure you use the --syncinternaldates option with imapsync.. otherwise the emails will show up in the listing in the Zimbra web interface as being "received" on the date you migrated -- thought I'd throw that in as a bonus )
Hope that helps.