An Outlook PST file exceeding the 50 GB size limit is prone to corruption and may result in a "cannot open the PST file" error. In case the PST file gets corrupted, you will not be able to access the PST file and its contents unless the file is repaired. Greetings, Peter
How to Increase Outlook PST File Size
Size of 1 pst in outlook is 2 gb
The minimum recognize Outlook PST File size when you create a new Outlook Data file will be 265 Kb.
The maximum size of a PST file depends on the version of Microsoft Outlook. Outlook 2003 and 2007 have a user-defined maximum that defaults to 20GB and can't really get much bigger in practice as otherwise Outlook gets too slow and has problems. Older version of Outlook (such as Outlook 2000, XP, and 98) have a fixed limit of 2GB. If your .pst file gets bigger than 2GB then Outlook will report that it is corrupted. [Note: utilities like Stellar Outlook PST Repair can help split large .pst files and fix any corruption problems they might have.]
Microsoft Outlook creates a PST file, while you configure an account in Outlook. The PST stores copies of messages, calendar, notes, tasks, contacts and other items. PST file may get corrupted because of many reasons, in that case, you would be unable to open Outlook. The reasons could be Virus, improper outlook shutdowns, corruption in header files, pst file has reached maximum size limit etc. In that case you can use outlook utility, named Inbox repair tool to fix your pst file.
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In your case it would be better to use professional recovery software. Tool below would be effective for recovering .pst file. Software helps you to restore corrupted emails up to 16TB in size.
Most probably the .pst file is damaged. Try running scanpst.exe (installed along with Outlook on your system) on the pst file. It repairs the file and makes it resuable. Outlook Pst file doesn't opens because of many reasons like corruption of PST file, PST size getting bigger than 2gb. Try to use recover pst file thanks to application below under all Windows OS, beginning with MS Windows 98
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