Microsoft's latest update for Office 2004 for Mac, Microsoft Office 2004 11.5.7, addresses a handful of significant security vulnerabilities surrounding specially crafted Office files that could enable an attacker to view, change, or delete data by executing remote code. The update addresses those issues by altering the way files are opened and parsed. It is rated Important for Microsoft Office 2004 for Mac and requires that you've previously installed the Microsoft Office 2004 for Mac 11.5.6 Update. The update is available from Microsoft's Web site and via the Office 2004 version of Microsoft AutoUpdate. (Free, 9.4 MB)
Disable Caps Lock
If you find yourself pressing the Caps Lock key accidentally as much as I do, note that you can disable it entirely in Mac OS X. Open the Keyboard & Mouse preference pane, click the Modifier Keys button, and in the dialog that appears, select No Action from the Caps Lock pop-up menu. You could remap it to another modifier instead, but that might make using differently configured Macs more difficult.
Microsoft Office 2004 11.5.7
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Realistically, your exposure is pretty low, so I wouldn't stress about this too much, and would recommend just being a little more cautious about opening files from dubious sources.