PST, a vital component of Outlook is the data file that contains all Outlook data, including email messages along with attachments, contacts, notes, appointments, journals, and other data items. Moreover, PST file is housed at local computer, making it easy for user to access it whenever required. One important thing to know about PST is its size limit. In Outlook 2002 and earlier versions, the size limit for PST is offered 2 GB, which is less than sufficient. In enterprises particularly, there is a huge amount of data, which does not find the space feasible. In turn, after analyzing the consequences of small size PSTs, Microsoft put its efforts to increase the size in the later versions i.e. Outlook 2003 and Outlook 2007 and so on.