file size limit

I realised that I could not copy file which are more than 100GB at the same time.. Anyone knows why? :confused:

I have Windows 7 build 7100 and have successfuly installed Outlook 2007, and transfered data files over from OUtlook 2003. Using multilple email address each with own data file, sending and recieving normally until trying to send large files (pdf files of 5MB or greater). Smaller files send ok...