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Windows 8.1 and Windows RT 8.1 will begin rolling out worldwide as a free update for consumers with Windows 8 or Windows RT devices through the Windows Store. Windows 8.1 will also be available at retail and on new devices starting on October 18th by market.

Windows 8.1 continues the vision we began with Windows 8 and is an example of our commitment to continuous innovation and improvement for our customers. And Windows 8.1 brings many improvements in areas like personalization, Internet Explorer 11, search which is powered by Bing, built-in apps including a few new ones, an improved Windows Store experience, and cloud connectivity with SkyDrive (and much more) that people will enjoy.

If you haven’t already, give a try with Windows 8.1 Preview. Business customers can begin testing Windows 8.1 for deployment in their environments with the Windows 8.1 Enterprise Preview.

Now it’s a good time to get started with new change, features, and APIs on windows 8.1.  Here are the resources you may find useful.

8.1 Product Guide for Developers

Dev portal article with high level descriptions of the new 8.1 features and links to more details

8.1 New APIs and features for developers

A breakdown by category of the new APIs for 8.1

8.1 Migration Guide whitepaper

Word doc on how to re-target your 8 apps for 8.1 and some of the “quirks” that you might find

Migration from Windows 8 to windows 8.1

Dev portal articles covers migrating Windows 8 apps to Windows 8.1 Preview

Windows 8.1 UX/UI
UX/UI design article on Windows 8.1 new windowing modes, new features and updates.

Upgrading Windows 8 apps to 8.1  (presentation)

Build video that covers migration to 8.1 and shows some examples

Designing and Building User Interfaces for Windows (presentation)

Build video that covers windows 8.1 UI design

What's New in XAML (presentation)

Build video on windows 8.1 new API in XAML

What's New in WinJS (presentation)

Build video on windows 8.1 new API in WinJS

New Search Experience (presentation)

Build video on how the new Search features work

Building Apps that Work Together (presentation)

Build video on brand new contracts that will integrate with  calendar and communication apps
Alive with Activity: Tiles, Notifications, and Background Tasks (presentation) Build video on new features on tiles, notification and Background tasks

Beautiful Apps on Any Size Screen (presentation)

Build video how the new app size features work (versus Snap state)

Monetization Opportunities for Windows Store Apps in Windows 8.1 (presentation) Build video on t best practices and guidance in Windows Store app and new Windows 8.1 opportunities

The Fast Lane for App Certification (presentation)

Build video on how the submission process works for 8.1

Are you an IT Professional?  Check out Get Ready for Windows 8.1 in One Page! by Keith Mayor.