Microsoft has responded to my newsgroup question about browser support for Office 2007. There are 2 levels of support. Here is their preliminary position which is subject to change before they RTM. I think there is a typo on the "nix" line about firefox version since it conflicts with a previous line.
"At this moment of Beta1TR release, IE for Windows is only supported.
More browser including Firefox, Netscape, and Safari will be added in
a later release (i.e. Beta2 and beyond).
Please note that there will be 2 support levels in terms of functionality you
can utilize. IE6 and IE7 for Windows are "Level 1" and have full functionality
on all sites including Central Admin site. "Level 2" browsers will have main
functionality with some different user experience due to functionality of
browsers such as ActiveX support. Central Admin site will not be supported
by Level 2 browsers either. Please find which browsers are classified as
Level 2 below.
Windows: Firefox 1.5+, Netscape 8.0+
MacOSX: Safari 2.0.2+, Firefox 1.5+
*nix: Firefox 1.5+, Mozilla 1.7.12+, Netscape 7.2+
Also be noted that this list would change from now to RTM. You should be
able to hear more details about browsers support when Beta2 is available."
Not much of a surprise on the Admin site. I find alot of people access the admin site from the SharePoint server itself rather than remotely. I doubt companies are running a non-IE browser on a SharePoint server.
