split large pst file into small parts split large pst file outlook 2003 large pst file splitter split large pst file outlook 2007 split large pst file outlook 2010 large pst file split large size pst file file size reduction split pst size limit pst size splitter pst file splitting improved outlook performance split large pst file software split large pst into small pst size large pst file split split large pst file into small chunks split pst size outlook split large pst file split large pst file into smaller split large pst file