This article originally appeared in TidBITS on 2009-08-06 at 12:49 p.m.
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Microsoft Office 2008 12.2.1 Opens XML Office Docs Again

by Adam C. Engst

Not much to say about this one. With Microsoft Office 2008 Service Pack 2, a bug was introduced that prevented all the Office applications from opening some of Microsoft's Open XML documents, templates, and macro-enabled documents and templates (see "Microsoft Releases Office 2008 Service Pack 2 [1]," 2009-07-20). Several commenters [2] on our article about Service Pack 2 had the problem, though all the .docx and .xlsx documents on my Mac seemed to open fine.

Microsoft has now released the Microsoft Office 2008 for Mac 12.2.1 Update [3] to fix this problem. In my initial testing, it was still able to open the Open XML documents - if you weren't seeing any problems before, it's probably not essential that you upgrade immediately. The update is a 23.8 MB download, and is available from Microsoft's Web site or by choosing Check for Updates from the Help menu of any Office 2008 application.