How to Rebuild an Exchange Mailbox

Written by jeff kaleth
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How to Rebuild an Exchange Mailbox
Exchange mailboxes are represented by files ending in .pst. (e-mail image by Hao Wang from

Rebuilding an Exchange/Outlook mailbox is a maintenance responsibility of the email administrator. Mailbox rebuilds become necessary when the user's e-mail account becomes corrupt. It is also helpful if the user reports that her e-mail account is moving slowly or is not responding. Exchange mailboxes are represented by files ending in .pst and can be rebuilt with the Index Repair Tool. This tool is installed by default with the Outlook client.

Skill level:

Things you need

  • Permission to the user's pst file in Outlook.

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  1. 1

    Locate the Index Repair Tool on your computer using Windows Explorer. It is located here: C:\Program Files\Common Files\System\Mapi\1033\SCANPST.EXE

  2. 2

    Double-click "SCANPST.EXE" to start the Index Repair Tool.

  3. 3

    Click the "Browse" button and locate the Outlook .pst file you would like to rebuild.

  4. 4

    Click "Start." The utility will now scan the mailbox file.

  5. 5

    Click the "Repair" button once the scan is complete.

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