How to Reduce Large Size Outlook PST Files?

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This blog discusses why it’s essential to examine Outlook’s PST data. Here, we’ve provided manual techniques for reducing the size of an Outlook mailbox.

These techniques, however, are useless if you need results right away. Use the promised remedy provided by Cigati PST Splitter to quickly fix the Outlook PST file too large an error.

You want to know how to minimize the size of your Outlook mailbox after reading a guest post.

You’ve come to the right place if your Outlook PST file is too big to work with. This article will discuss techniques for managing or minimizing the size of Outlook PST files.


Nowadays, hardly anyone without some knowledge of Outlook. Outlook Webmail uses file1.PST.

Quick Solution: Reduce Outlook Mailbox Size with PST Splitter

The Manual technique to minimize the Outlook mailbox size necessitates that you go through a laborious set of procedures one at a time. However, you frequently only have a little time. Choose a dependable Advik PST Splitter Tool in this situation. It allows you to divide a PST data file into smaller Outlook PST files. It may be used to partition huge PST files with ease and precision.

All your email data is saved in PST and OST files by Outlook Webmail. All your emails, both sent and received, contacts, calendar events, tasks, notes, and associated file attachments are stored in the OST and PST Outlook data files.

Your mailbox may get bigger the more you use Outlook for email. The more attachments that are added, the larger the PST file becomes. You cannot use Outlook after exceeding the maximum Outlook PST file size restriction since there needs to be more room for it.

The occupied space in the data file is not released even after clearing the Deleted Items folder or setting it to automatically empty when Outlook is closed. However, you can recoup that space by manually reducing your Outlook data file.

How to Reduce Outlook Mailbox Size?

The following three procedures are required for manually mending an Outlook PST file that is excessively large. They must be completed in succession.

Step 1. Examine your account and Remove Everything you don’t want.

Before beginning the compacting process, you can browse through Outlook and remove Everything that is no longer necessary. You can look at the sizes of your different folders to see which items will clear the most space. To accomplish that,

  1. Click the “File” tab and select the mail Inbox you want to condense.
  2. Click “Tools” and choose “Mail inbox box Cleanup” from the drop-down menu on the current screen.
  3. Select “View Mailbox” from the Mailbox Cleanup dialogue box. You may view the sizes of each folder in the currently selected account in the Folder Size dialogue box which appears.
  4. View the larger folders as you scroll through; you should eliminate some stuff there. Click “Close” when you’re done.
  5. Check the mailbox size of the Deleted Items folder by clicking “View Deleted Items Size” right now.
  6. Before compressing our data file, we need to delete the Deleted Items folder, even though it is small.
  7. When you select “Close,” you are taken back to the Mailbox Cleanup dialogue box.

Select “Close” to return to your account and delete more items. Remove any unnecessary emails, calendars, tasks, and notes.

Step 2. Delete Everything from the Items Folder

If the Deleted Items folder still contains items, there are two ways to empty it.

  1. The first method is to access the Mailbox Cleanup dialogue box and select “Empty” if it is still open.
  2. A confirmation dialogue box will appear to confirm that you want to delete the items in the Deleted Items folder permanently. Decide “Yes.”

If the mailbox is not open:

  1. You can also delete the Deleted Items folder straight from your account’s Mail pane as an alternative way.
  2. Make sure the mail pane is open to accomplish this. If not, use Ctrl+1 to bring up the email window.
  3. Then, right-click on the picture of the Deleted Items folder in the account you just.

Step 3. Compress the contents in the Outlook File

It’s time to condense your Outlook data file once you’ve deleted anything you don’t want and cleared out the Deleted Items folder. For that:

  1. Click the “File” tab once again in the main Outlook window.
  2. Verify that the Account Information screen is open. If not, then
  3. In the list of things on the left, click “Info.”
  4. Select “Account Settings” from the drop-down menu after placing your cursor over “Account Settings.”
  5. To access the “Data Files” tab, select the “Account Settings” dialogue page.
  6. Select the Outlook data file from the list you want to condense and click “Settings.”
  7. When a POP3 account (.pst file) is currently chosen, the Outlook data file dialogue box is displayed.
  8. Outlook data file dialogue box appears if the selected account is a POP3 account (.pst file). Click “Compact Now” here.
  9. While compressing the Outlook data file, a dialogue box displays the current status.
  10. The Outlook Data File (or Outlook Data File Settings) dialogue box will appear. To close it, select “OK” or “Cancel.”
  11. Click “Close” in the Account Settings dialogue box.

You will clear the space as you finish the process.

However, as you can see, the manual technique calls for so many steps. But what if there was a quicker way to minimize the size of an Outlook mailbox?

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