imapsync shouldn't cause downtime. You should be able to do it while user's are logged in.
For auth you can just have Zimbra auth against your existing LDAP and this will keep you from needing to sync passwords. You'd still need something to sync create/delete's in LDAP but that's an easier problem to solve.
Is this a temp solution and eventually you'll turn off the old system, or do you actually plan to run both systems in parallel for a long period of time? If so why? |