Yes you will be able to keep previous years of data. You can download the
M2004 trial version and see if you like it. Beware that the M2004 data file
cannot be read by M2002 so you may need to install M2004 in a different
folder and copy your M2002 file into that folder. Also be aware that you
can't have both M2002 and M2004 running at the same time.