Just one week after Apple seeded the first build of Mac OS X 10.5.5 to developers the company has released a second build of the next update to Mac OS X Leopard.

The latest build labelled 9F9 packs a further 24 bug fixes pushing the number of fixes past 100 in Mac OS X 10.5.5.

Fixes in this build are reported to be aimed at Address Book, Mail.app and syncing services.

Developers have also been asked to focus testing on Directory Services, Fonts, mDNSResponder, Screen Sharing, and X11 as well as the items from last weeks build.

Mac OS X 10.5.5 is estimated for release in late-September.