Office 2004 for Mac
Office 2004 for Mac is a version of Microsoft Office developed for Mac OS X. The software was originally written for PowerPC Macs, so Macs with Intel CPUs must run the program under Mac OS X's Rosetta emulation layer. For this reason, it is not compatible with Mac OS X 10.7 and newer.
Office 2004 was replaced by its successor, Microsoft Office 2008 for Mac, which was developed as a universal binary to run natively on Intel Macs. However, Office 2008 did not include support for Visual Basic for Applications, which made Microsoft extend the support period by an additional 27 months for their older Office 2004. Microsoft ultimately shipped support for Visual Basic in Microsoft Office 2011 for Mac, which also dropped PowerPC support altogether.
As of January 10, 2012, support for Office 2004 for Mac has ended: no further updates or support will be provided from Microsoft.
Editions
Microsoft Office for Mac 2004 is available in three editions: Standard, Professional, and Student and Teacher. All three editions include Word, Excel, PowerPoint and Entourage. The Professional Edition adds Virtual PC. The Student and Teacher Edition cannot be upgraded, which means when a later version of Office is released, people who purchased the Student and Teacher edition must buy a new package.