We are using zimbra open source edition 4.5.3 for the last few years. Right now we want to migrate to the latest edition.
Is there a step by step procedure to do this? We have googled and tried many options, but all failed.
we are more interested to see how we can do a manual migration, I mean a manual backup and restore of mysql database, ldap, stores, indexes, configs etc.
Total mail box size is around 80G,
Thanks & Regards