He's telling you that not all programs, including some newly released ones,
are supported on Vista. It's life - it happens every time a new OS comes
out.
Microsoft only supports Office 2003 and 2007 on Vista. They do not provide
support and updates for programs long out of the support lifecycle unless
you have a long standing support contact - and that's what the extended
support for Windows 2000 requires. Hotfixes, such as for the upcoming US and
CAN daylight time updates, are not publicly available for Windows 2000.