I've downloaded to versions of zimbra collaboration open source. the latest being zcs-7.0.1_GA_3105.RHEL6_64.201103042110448, also the 7.1.4 from 20120105094634. to a fresh install of Centos and attempted under RHEL6.
As root I've attempted to untar the files with tar -xvzf
but receive numerous "cannot change ownership to uid 503 permission denied" errors.
I've gone ahead and an ID zimbra with uid and group ID of 503 also a ID 1000 since I saw some complaints of this ID also.
I again attempted untar with --owner=root and --group=root...
Typically this is due to someone not creating the tarball correctly.