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How to use OST Crop tool?

Whenever .ost file and .pst file exceeds their maximum file size limit, any attempt to open them led to series of troublesome errors. OST file size limit is crossed and there is fear of corruption in file. What happens is - when you start MS Outlook or try to open an offline folders .OST file or .PST file, you may receive the following error message:

Errors have been detected in the file < file_path > . Quit all mail-enabled applications, and then use Inbox Repair Tool.

Obviously, this problem occurs because of crossing 2 GB file size limitation of OST file and PST file (in case you are using Outlook 2002 and previous versions). This makes the OST file inaccessible. So in order to recover lost email data from OST file, you need to use OST Crop tool utility, which is also called 2 GB Truncation Utility. However, following must be taken care of while using crop software.

  • You must have 2 GB of free hard disk space.
  • The utility truncates the .pst and .ost file to under 2 GB. It is important that in order to have sufficient working space, you must truncate the file between 20 to 25 megabytes (MB) less than the 2 GB limit. The truncated data then gets removed from the new copy, which clearly indicates that there are few messages that are missing from the recovered copy.
Following steps will guide you for operating OST crop software.
  • First of all, download the 2 GB Truncation Utility or PST/OST crop tool from Microsoft support.
  • Extract the 2gb152.exe file to an empty folder. Five files appear - Msstdfmt.dll, Msvbvm60.dll, Pst2gb.exe, Readme.rtf and Readme.txt.
  • Now Start the Pst2gb.exe program.
  • Click Browse to select the oversized .ost file or .pst file, and then click Open.
  • Click Create, select the name and location of the truncated data file that you want to create, and then click Save.
  • Type in the amount of the data that you want to truncate in the .pst file. There is not a correct amount that you use. Choosing 20 to 25 MB gives you best results, but you may have to truncate more or less.
  • In case, you truncate 25 MB of data and the process works, repeat the process and truncate the original oversize .OST and .PST file by only 15 MB. If that works, then try the process with 5 MB. If 25 MB does not work, repeat the process and truncate the original .pst by 35 MB. If the process does not work, increase the amount until the process is successful.
  • Now run the Inbox Repair Tool (the Scanpst.exe file or Scanost.exe file) on the truncated file.
  • Open the repaired .pst or .OST file in Outlook.
  • If the file does not open, discard the truncated file, and repeat the process with the original .pst or .ost file. Truncate more data than in the first attempt, and try the process again.

This way you are able to overcome OST file size limit and its related issue.


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