It's possible. Yes, it is!
NOTE: this guide is for education purposes only, not promoting for illegal actions
Requirements:
1. Crossover Linux Professional 7.0: get it here: Download
2. Installation package for Ms Office 2007.
How-to:
1. From menu, choose CrossOver -> Install Windows Software. Pick Microsoft Office 2007, locate the setup.exe file, then install it as in Windows.
2. After all installation done, we need to crack it though.
a. Get this file: Proof.XML
b. Replace the old one located under:
/home/[YOUR_USER_NAME]/.cxoffice/MSOffice/drive_c/Program Files/Common Files/Microsoft Shared/OFFICE12/Office Setup Controller/Proof.enc. From CrossOver menu -> Run a Windows Command, type: regedit
d. Find the key: HKLM\Software\Microsoft\Office\12.0\Registration\DigitalProductID, and delete it.
e. Close all CrossOver-related program.
d. Under main menu: Applications, you can see Windows Application menu, and enjoy !
Enjoy !