How big can a PST file be?
The default .pst file size limit in Outlook 2003 and in Outlook 2007 is 20 GB.
The default .pst file size limit in Outlook 2010 and in Outlook 2013 is 50 GB.
see also: The file size limits of .pst and .ost files are larger in Outlook 2010 and Outlook 2013
This article was originally published in the GWAVA knowledgebase as article ID 2758.