This thread has been a great help, but what about a scenario like ours?... We already upgraded to 7.2 and want to move from a CentOS 5 server to a CentOS 6 server (both 64 bit machines). We end up with this issue:
/usr/bin/perl: symbol lookup error: /opt/zimbra/zimbramon/lib/x86_64-linux-thread-multi/auto/Data/UUID/UUID.so: undefined symbol: Perl_Tstack_sp_ptr
A I understand from one of our engineers, the problem is that CentOS 5 uses Perl 5.8 and CentOS 6 uses Perl 5.10. And the mismatch of Perl versions is what prevents Zimbra from starting on the new server.