No, Microsoft Entourage is included in the Office for Mac suite and is the OS X compatible mail client, whose equivalent is Microsoft Outlook in the Windows world. General opinion, is that Outlook is a more robust, less buggy client than Entourage is. See http://blog.gingergeek.com for Entourage tips and tricks.
No. Office 2007 requires Windows.
Yes. All 2007 Office applications work with Windows 7.
Microsoft Office 2007 was only available for the Windows operating system. If you have a disk with Office 2007 for Windows it will not work with Mac OS X. If you have the Windows operating system on your Mac then it will work with that. For Mac OS X you will need a specific version of Microsoft Office for Macs (See links below) . Office 2008 was the last Mac version but this is about to be replaced by Office 2011 any day now.
Office XP, 2003, 2007 and 2010. Older ones may work, but are unsupported.
Office 2003 down to Office XP pro
Yes.
I know for sure that Office XP (2002), Office 2003, and Office 2007 are compatible. As for earlier versions, I'm not sure, but there is no point in using Office 97 these days anyway. So whatever version you choose (as long as it is not prior to 2002, it will work.
Yes. As an owner of Windows 8 and Microsoft Office 2010, I can fully prove that it is possible. Also, since I know a person who happens to work for Microsoft, Microsoft Office 2013 will run on Windows 8 as well (when you plan to buy it).
The current version is Office for Mac 2011. The previous version was Office for Mac 2008. Office 2007 was for the Windows operating system and will not work with Mac OS X.
Yes. Microsoft have made sure that office will work perfectly with Windows 7
Microsoft Windows 7 is compatible with Office 2000 but updating Office might not be possible. Outlook 2000's contact list will not work with Windows 7.
Yes , Office Publisher 2007 is compatible with Windows 7, but you can get Office 2010 Pro as Office 2007 is outdated.