This is not exactly related to horde. But, the list members can definitely help me. I am using Cyrus-imap provided with RHEL 4 Update 1. Does this cyrus-imap makes use of libc-client-2002e-8 package. There is a update available for this package on rhn.redhat.com. I want to update this package only if cyrus-imap internally makes use of it. Regards, Anant Athavale.