Center for Cellular and Molecular Biology (CCMB) which earlier used Mithi Connect Server for its E-mail system has now been migrated to Zimbra Open Source Collaboration Suite 7.0.
Migration process has been smooth without taking any downtime on the E-mail system. 1200+ mailboxes consisting of around 1 Terabyte of data have been seamlessly migrated to Zimbra.
Mailbox sizes upto 15 GB and maximum attachment sizes of upto 50 MB have been migrated successfully.
Users were NOT required to do any changes to either their passwords or their E-mail client settings (Outlook, Eudora, Entourage, etc.,) even after migrating to the new system. Authentication at CCMB uses an external Red Hat Directory Server (RHDS).
Automated user creation (in Zimbra), with respective profile, based on user accounts created in RHDS has also been accomplished.
Planning, Scripting, Migration and Integration took a couple of weeks to complete.