In both Mageia 1 repo's there is the same filename but with diffferent properties:
/mirror/mageia/distrib/1/x86_64/media/core/backports_testing/
mozilla-thunderbird-3.1.12-1.mga1.x86_64.rpm 9131728 07/09/2011
/mirror/mageia/distrib/1/x86_64/media/core/updates/
mozilla-thunderbird-3.1.12-1.mga1.x86_64.rpm 9130985 19/08/2011
A side effect is that in the graphical update manager there is no rpm selected.
But when exiting this window, I get the message that files are selected.
Please clean up!