After almost two years and involved the release of four Technical Previews, Zeyad announced the worldwide availability of the Open XML SDK 2.0 for Microsoft Office. The Open XML SDK plays an integral part in creating Office document solutions that work on the client or server. The Open XML SDK allows you to create, consume, and manipulate Open XML files without needing to automate Office client applications.

Download the Open XML SDK 2.0 for Microsoft Office:
This download provides strongly typed part and content classes for use with Office 2007 & Office 2010 Open XML documents. http://www.microsoft.com/downloads/details.aspx?FamilyID=c6e744e5-36e9-45f5-8d8c-331df206e0d0

Please note:

  • Open XML SDK 2.0 is freely redistributable by any solution provider implementing the formats
  • Office applications are not required to use the Open XML SDK 2.0, and no software purchase is required.
  • Developers can freely use the Open XML SDK to build document processing solutions for Microsoft Office files and for other implementations of the IS29500 standard

If you want learn more about Open XML SDK, then i would recommend to try with Brian Jones related articles (a lot of real world scenarios/solutions that are built with the SDK). Apart from this, here is a summary of links that will help you learn more about the Open XML SDK: