How to break PST files now it is not a too complicated query because now you have Outlook PST splitter tool. The software is comfortable to split large and bulky PST files into smaller parts without and hampering data .The software split entire oversized PST file like journals, notes, calendars, task, notes etc and save them at safe location wherever you want. Split PST software supports all versions of MS Outlook 2000, 2003, 2007, 2010.