You caneven use Disk Utility's Restore function to image your Lion boot discimage onto a external drive suitable for performing a clean installon a optical-drive-less MacBook Air, or Mac mini server.
With this disc you can boot any Lion compatible Mac, and install10.7 just like you installed previous version of Mac OS X.
If your using Mac's in a mission critical type environment or have third party hardware or software you must rely upon working correctly. Because Microsoft Office 2004 offers VBA macro support and an interface that some find superior to the subsequently introduced Office 2008, many users have stuck with Office 2004 (or even Office 2001 or Office X).