From what I've read (and it's been fairly extensive, both back in August, and again today) it's not the basic functions of Office that will be affected with the next Mac version - it's the Visual Basic macros, which many businesses use extensively, mostly in Excel. The Mac Business Unit has chosen not to port this to Intel, citing the time it would take and the years of delays it would involve, given that the code is all PPC and creaky in the extreme - on the PC side as well. The other part of this equation is the oft-repeated statement that Microsoft will be abandoning Visual Basic scripting on the PC side anyway - that Office 2007 is likely the last version to include it (and even then, it isn't installed by default - it's a separate install).
So...the question is - will they indeed abandon it in favor of .net solutions, and if so, will all of this be moot and will there still be a viable, compatible version of Office for Mac? And what is everyone who needs that compatibility supposed to do in the mean time? Things can take a long time to change in the business world. What sort of incompatibilities will there be between Office:Mac 2004 and Office 2007 for Windows, should Mac users choose not to upgrade?
NeoOffice is not a solution for those wishing to run macros - it doesn't do VB.
Of course, many have responded with "well, just buy the PC version of Office 2007 and run it in Parallels or BootCamp" - which is all very well in the short term, if you happen to have an Intel Mac. Costly though - and you're forking over more of your hard-earned cash to M$. It's far from a satisfactory solution for many, many people.
And what if other software producers like Adobe start pulling this on us? Then where are we? Granted - Adobe relies much more heavily on Mac users than M$ does, but one cannot deny the attractiveness of developing for only one platform!
Meanwhile, it's going to be interesting to see where things like Google Docs go...(anyone used it yet?)
And BTW - Microsoft got approval for OpenXML as an international standard today:
http://apnews.excite.com/article/20061207/D8LS9NUG0.htmlApple backed them in this effort - ya think maybe they'd return the favor???