How to Repair an Oversized PST
PST, also known as a personal storage folder (.pst), holds all the data linked with your Exchange-based email account. An oversized PST will generate errors once it goes over its 2-gigabyte space limitation, and the "Inbox Repair Tool" will not be able to troubleshoot this issue. However, Microsoft offers a PST crop tool that can decompress and repair an oversized PST. With this tool, you can truncate your .pst file.
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Instructions
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Navigate to the Microsoft Download Center and download "Exchange 2000 Tool: PST2GB" (see Resources).
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Double-click to extract the contents of the .EXE file to an empty folder in a secured location on your hard drive.
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Locate the file titled "Pst2gb.exe" and double-click it.
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Browse to navigate to the location that stores your oversized .pst file. Single-click to select it and hit "Open."
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Click "Create." Type a name and location for the truncated PST file. Click "Save."
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Enter the amount of the data that you want to truncate in the .pst file. Microsoft recommends 20 to 25 megabytes for best results.
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Run the "Inbox Repair Tool" (Scanpst.exe) on the smaller .PST file.
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Launch your default email client from the "Start" menu. Click "Open." Browse to navigate to the location of the repaired .PST file.
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Right-click the root folder of the .PST file and select "Properties."
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Hit "Compact Now" to end the task.
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