On accounts I migrated from another server (via zmbackup/zmrestore), there is a strange thing: the "Last Login Time" (or zimbraLastLogonTimestamp in a "zmprov ga accountname") is never updated, even after a login over pop3 or via the webinterface. For new accounts everything is fine.

I don't really see how to debug that phenomena, and browsing the forums/docs didn't helped (yet, still searching).

Maybe you will have a hint?
regards, Olivier