Office - handwriting recogntion if not using MS office XP or Windows Vista

I have been using handwriting recognition in MS office XP in Windows XP
operation.  I would like to upgrade to MS office 2007 but still using Windows
XP operation, but MS Office 2007 don't have the handwriting recognition
moduel.

Windows Vista operating system now has the handwriting recognition input
module.

How can i still use handwriting recognition functions if i don't upgrade to
Windows Vista?

Use Office 2003 then.