Some of our clients have mixed 2003/2007 environments - as they roll 07 out to users.
There are considerations - formats, but that is easily managed via a policy [setting defaults to 97-2003 format in most cases], or education of users ref differences in formats. (Usually a combination of both). So his concerns are relevant, though not directly related to the poll.
BTW, the driver behind moving to Office 2007 is not newness [you can imagine, business rarely spend a dime that does not benefit them] - it is productivity and users overwhelmingly like Office 2007's new ribbon interface and how it exposes relevant features and formatting options. They also like the ability to distill documents to .PDF.
Working in and out of differing formats does have some potentially devastating consequences, too - take a document that originated in Office 2007, saved to 97-2003 format, edit it in Office 2003 and then 2007 again - adding objects, labels, etc... and see what happens... you'll be in one righteous mess and Office 2003 users [say a client's customer] won't see all the objects/labels, etc... We helped a legal services firm sort out just such a mess - ***we had offered and strongly recommended training that would have been free [free because I expected just such a mess to take place and resolving it is a lot more costly than training is]. They declined the offer and set out on their own and got bitten.
Lesson is, as it reinforces what #6, said, their are pot holes and more universal deployments are actually more common - along with training around them. I do agree with #1, - any review has to include the perspective of working with different versions - after all, not all people outside an org will be using the same version as used internally and that is an issue that impacts all businesses - small, and large enterprises alike.
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