Hi,
We have planned a migration from 32-bit to 64-bit for a while now because this server has outrun it's capacity. This is the case:
Both the new and old server is hosted on same Vmware vSphere 4 platform running on Dell R710 servers and Equallogic SAS/SATA SAN. The 32-bit server has about 400 users and 400GB mailstore. We have tried some migrate tests by copying /opt/zimbra/store to the new server but this process takes about 9 hours which is a bit too long for us.
Could ZeXtras Suite be the solution for us?
It's also important that the migration is transparent for the users as we use network edition with a lot of outlook users which we don't want to reconfigure / resync. With that meaning the 32-bit dns / ip should be taken over by the 64-bit server.
I would really appreciate suggestion from one of the admins here 
Thanks in advance!