Description of problem:
yum can't install lightning in the actual state of the repo (fedora + updates active)

Version-Release number of selected component (if applicable):
fedora 11

How reproducible:
always

Steps to Reproduce:
## thunderbird is not installed ;
-bash-4.0# LANG=C yum info thunderbird*
Loaded plugins: downloadonly
Available Packages
Name       : thunderbird
Arch       : i586
Version    : 3.0
Release    : 2.8.b4.fc11
Size       : 35 M
Repo       : updates
Summary    : Mozilla Thunderbird mail/newsgroup client
URL        : http://www.mozilla.org/projects/thunderbird/
License    : MPLv1.1 or GPLv2+ or LGPLv2+

Name       : thunderbird-lightning
Arch       : i586
Version    : 1.0
Release    : 0.7.20090715hg.fc11
Size       : 1.2 M
Repo       : updates
Summary    : The calendar extension to Thunderbird
URL        : http://www.mozilla.org/projects/calendar/sunbird/
License    : MPLv1.1 or GPLv2+ or LGPLv2+

## So I'm trying to install it :

-bash-4.0# LANG=C yum install thunderbird-lightning
Loaded plugins: downloadonly
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package thunderbird-lightning.i586 0:1.0-0.7.20090715hg.fc11 set to be updated
--> Processing Dependency: thunderbird < 3.0-2.7.b5 for package: thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586
--> Processing Dependency: thunderbird >= 3 for package: thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586
--> Processing Dependency: thunderbird >= 3.0-2.7.b4 for package: thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586
--> Running transaction check
---> Package thunderbird.i586 0:3.0-2.3.beta2.fc11 set to be updated
--> Processing Dependency: thunderbird < 3.0-2.7.b5 for package: thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586
---> Package thunderbird.i586 0:3.0-2.8.b4.fc11 set to be updated
--> Finished Dependency Resolution
thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586 from updates has depsolving problems
  --> Missing Dependency: thunderbird < 3.0-2.7.b5 is needed by package thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586 (updates)
Error: Missing Dependency: thunderbird < 3.0-2.7.b5 is needed by package thunderbird-lightning-1.0-0.7.20090715hg.fc11.i586 (updates)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
-bash-4.0#

  
Actual results:
lightning is not installed

Expected results:
lightning to be installed

Additional info:
This is a regression.