I just did a manual resync of my local update repo from mirrors.kernel.org/centos/5.1/updates/i386/ I got a new version of Thunderbird, but not a new set of files in the repodata directory. Thus when I did a yum update against my local repo, I did not get the new version of Thunderbird. I will note that the files on my local repo are dated Dec 20th and the ones on mirrors are dated Dec 21st. The command I am using is: #!/bin/sh rsync -auv rsync://mirrors.kernel.org/centos/5.1/updates/i386/ \ --delete --exclude=debug/ /repos/centos/5.1/updates/i386 Oh, and the old version of Thunderbird was not deleted....