Move from Zimbra 5.0.16 32 bits. Fedora core7 to Zimbra 5.0.16 64 bits. Ubuntu 8.04 successfully by document from Network Edition: Moving from 32-bit to 64-bit Server - Zimbra :: Wiki

After move upgrade from 5.0.16 64 bits. ==> 5.0.18 64 bits. is very Smooth.

Thank very much Zimbra Team .
Kernel