Synching calendars and contacts

I use the full range of KDE functions bundled as 'Personal Information 
Manager' on my ASUS Eee netbook.  My desktop machine, which I have had 
from before I got converted to Linux, runs Mozilla Thunderbird and its 
calendar Sunbird under Windows XP.  I therefore have, in effect, two 
diaries that I keep connected by exporting .ics files by e-mail and 
uploading onto the other machine.  As this is time-consuming, I often 
find that I'm out with the netbook without an updated diary.  Is there 
any way that I could couple the two machines up easily and get Sunbird 
to synch with Kmail and Korganiser?

Keith Cowling