Windows only: Microsoft is pushing out Service Pack 2 for Office 2007, promising significant performance improvements and support for the OpenDocument format, among other things.
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In all the update packs in hundreds of bug fixes and improvements for Microsoft's suite of office applications, which you can see in their entirety in this Excel doc. If you're an Office 2007 user, now's the time to fire up Windows Update and get going on that 290MB download. If you don't want to go through Windows Update, you can also download the file directly from Microsoft here.