Hi!
By default a NTFS partition can be read. On my computer I have Win Xp Pro and I read the data on it without any problem...
About writing, the description of the kernel module to write onto a NTFS partition says:
WARNING: Do not use this option unless you are actively developing NTFS as it is currently guaranteed to be broken and you may lose all your data!
So, I think one should avoid writing on a NTFS partition. Moreover, I read in the developers site for NTFS support that the module works (more or less) with Windows NT since there are variouse versions of this file system (all not properly documented :oops).
Bye :D