Microsoft Office 2013 and later fully support ISO/IEC 29500 Strict,[73] but do not use it as the default file format because of backwards compatibility concerns.
[76] On July 28, 2008, Murray Sargent, a software development engineer in the Microsoft Office team confirmed that Word 2007 will have a service pack release that enables it to read and write ISO standard OOXML files.
[75] Microsoft Open XML Format SDK[78] contains a set of managed code libraries to create and manipulate Office Open XML files programmatically.
[80] On March 13, 2008, Doug Mahugh, a senior product manager at Microsoft specializing in Office client interoperability and the Open XML file formats, confirmed that version 1.0 of the Open XML Format SDK "will definitely be 100% compliant with the final ISO/IEC 29500 spec, including the changes accepted at the BRM".
[80] In a ComputerWorld interview from 2008, Doug Mahugh said that "Microsoft would continue to update the SDK to make sure that applications built with it remained compliant with an Open XML standard as changes were made in the future".