PST file is nothing but a Personal Storage file which is used in Microsoft Outlook to store all data of Outlook profile. Outlook data includes emails, calendars, contacts, notes, to-do lists, journals, RSS feeds, meeting requests, etc. PST file not only provides data security, it also provides a lot of data storage space which is not possible by the web-based email clients.
Using Outlook has many advantages, as it is very simple to backup all data and migrating Outlook to a newer version or another operating system. To take Outlook backup, just you need to take the copy of a PST file which is located in “C” drive’s “Documents” folder. PST file was used in almost all the versions of Outlook like Outlook 2000, 2003, 2007 and 2010. However, the PST file has its size limitation in MS Outlook. The size of PST file was different for different versions of Outlook, like PST file size in earlier version Outlook 2002 is 2 GB and in latest version Outlook 2010 it was 50 GB.
The size limit associated with PST file of Outlook issues many matters. There are lots of possibilities to get PST file corruption if it crosses its size limitation. Due to the oversized PST file, the Outlook will not open and it will display errors. Once the PST files increase beyond its limitation, you will not be able to work with Outlook. In that case, you need to repair large PST file by making use of some third party tool. The most popular software is PST repair tool, which is used by almost all users of Outlook, to fix large PST file Outlook 2007, 2003, 2002, 2010 etc.
You can also minimize the possibilities of oversized PST file by making use of Outlook 2003 and 2007, where the PST file size is 20 GB. Still, there are chances of PST file corruption due to oversized PST file. It may happen because of plenty of email conversations through the Outlook profile. The attachments which are stored with emails can increase the size of PST file. Even if you deleted emails to make free space in PST file, still they are stored in “Deleted Items” folder which is stored in Outlook. If you deleted emails from this folder, they are not permanently deleted, only the PST headers are deleted and that space is just marked as empty. Only by compacting PST file, its size can be reduced. If any error occurs during compacting of PST file can also lead to its corruption.
There have been also other reasons for PST file corruption such as virus attack, improper shutdown of the computer system, abnormal termination of Outlook, operating system crash, power surge, sharing file over network, file system corruption, etc. Still, you have the chance to repair oversized or corrupted PST file and to recover all attributes of Outlook. Oversized PST file can be repaired only by making use of some advanced repair tool like “Repair Outlook (PST)” software. This software repairs Outlook mailboxes, the recovered data stored in a new PST file and later this file can be imported into your Outlook profile. You can download a demo version of this software if you want to evaluate Outlook data recovery.