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  Software Prerelease At a Glance (Chart)    
   

As Microsoft’s products move from development to shipping, they go through a set of interim releases, summarized below, designed to give Microsoft feedback on their contents and quality and help customers plan for deployment. Earlier releases help determine the features and architecture of the product while later ones serve primarily to shake out bugs.

Release What To Expect What Can Be Done With It
Milestone Internal product checkpoint or baseline Not intended for distribution outside Microsoft
Alpha (or preview) First distribution outside Microsoft

Incomplete features

Will have bugs, including some that may cause crashes and data loss

Evaluate features and architecture with aim of influencing product team or deciding if the product is worth further examination
Beta All features implemented

Basically stable, particularly around core scenarios, but will still crash

Evaluate features for preliminary deployment plans
Release Candidate Complete product with all features working and documented

Shipping quality

Final testing

Evaluate performance and scalability