Apple has released yet another seed for OS X 10.8.3 today, Build 12D50, to developers in the Mac Dev Center. This is the fourth seed since the original 10.8.3 beta back in November.
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The new developer seed for OS X Server v2.2, Seed 2, is out. In an email sent to developer accounts, Apple announced the new download, and included a link to the seed download source, a set of instructions on how to instal and/or upgrade from various previous versions of OS X Server, and a PDF with the new changes detailed.