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Apple Seeds First Developer Build of Mac OS X 10.6.6


In a rather unusual move, Apple today seeded the first developer version of Mac OS X 10.6.6, known as Build 10J521, even before the company has publicly released Mac OS X 10.6.5.

As 9 to 5 Mac notes, there are no documented known issues in the build and the seed notes mention a focus on support for the forthcoming Mac App Store.

- Contains developer support for fetching and renewing App Store receipts. See "Validating App Store Receipts" for more details.

Interestingly, the Mac OS X 10.6.6 update is only 3.7 MB in size, suggesting only very minor tweaks at this point.

The unusual early seeding of Mac OS X 10.6.6 relative to its predecessor and the apparent requirement of Mac OS X 10.6.6 for certain Mac App Store functions suggest that Apple is likely fast-tracking the operating system update for release in the not-so-distant future.

Apple announced during its October 20th media event that the Mac App Store would launch on Mac OS X Snow Leopard within 90 days, and just yesterday the company began accepting submissions from developers for inclusion in the Mac App Store.

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20 months ago
This is the first time I can remember Apple put the next point update beta in their developer connection before the previous one is released.


10.6.6 Delta Update (10J521) is up on ADC. It's only 3 MB's in size though.
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20 months ago
10.6.6 must be focused on the new Mac App Store.

And it means 10.6.5... imminent.
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20 months ago
That is really weird. The last time Apple was advancing versions that quickly was from iTunes 4 to 5 I think, where they released version 4, the DRM was hacked, and they released version 5 like a week later. :confused:
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20 months ago
From the release:

- Contains developer support for fetching and renewing App Store receipts. See “Validating App Store Receipts” for more details.
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20 months ago
So much closer to 10.7 and The Mac App store it's an exciting time for Mac users :)
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20 months ago
Well I still hope a trackpad update comes out soon. Its getting annoying having to deal with a stuck trackpad.
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20 months ago
Sounds like 10.6.6 will be a requirement for the Mac App Store?
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20 months ago
Thus endeth the unreasonable speculation that 10.6.5 will be the last Snow Leopard update.
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20 months ago

Sounds like 10.6.6 will be a requirement for the Mac App Store?


Thats my guess. I also think  Will want the App Store running before the holidays.... so they can get a nice profit.
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20 months ago
Where's 10.6.5, are they going to release it? or just leap frog to 10.6.6?
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