Office 64

Microsoft is planning on releasing a 64bit version of the next version of Microsoft Office, 12, the sequel to Office 2003 for Windows Xp 64bit edition users.
Alas it is mainly Windows Sharepoint Server and Content Management Server that will be able to utilize the support.
According to Microsoft the 64bit version will be released shortly after the official release sometime during 2006.

Source: CRN news