Steps to compress PST/OST Files

After installation, open the PST Management Suite and click the PST/OST Compact and Compress option from the ribbon bar or the main menu.

Step 1: Click on Add button to select and add the source PST/OST File.

You can also use the Search option to find the desired PST/OST files for conversion and tap OK.

Step 2: After Clicking on the Next Button a new Wizard opens.

The Compress & Compact option page has three parts:

1. Target Folder: This option will allow you to separately save all PST/OST file attachments at the target location.

2. Attachment Options: This also has two options for what you want to do with your attachments:

Remove all Attachments: As you select this option, the software will remove all the attachments from the compressed PST/OST. There are two options as follows -

Backup attachment in target folder
Backup and leave a text attachment

Replace Attachments by archive attachments: Select this option to replace the PST/OST file attachments with an archive attachment to reduce the PST/OST file size. There are two options as following;

Backup attachment in target folder
Archive Password

3. Mail Options: Mail option has two sub-options.

Exclude duplicate Items
Exclude deleted items

Create a new compressed PST file in the target folder: Using this option you will get a new PST file in your selected target folder. The source file will remain unchanged but you will get a new compressed resultant PST file.

The source file will compress (Changes will take place in the source file itself): With this option, the primary source file will itself get compressed; there will be no creation of a new file. Compression will take place in the added source file.

However, after compression, the OST/PST file size may not show less size (the actual size) even after it is compressed. It is due to the inability of PST/OST file size property change. Although, you can change the size property of the source file by following the below-given steps if you need:

Open your file in Outlook.
Now, make a right-click on the file.
Click on the data file properties.
Click Advanced…
finally, click on the Compact Now button

Now, you will get a file that shows the original size of the compressed file. (The actual size of the compressed file).

Once you have applied the compress files option, according to the necessity. Then click the 'Next' button. After that, the PST Compress & Compact Status will display in the next window.

Step 3: PST/OST Compress & Compact Process Status

In the status section, you can see the current status of the PST/OST Compress & Compact process. You can check the total number of items counted, processed items, failed items of selected PST/OST files through the status window.
After getting a message "Process completed successfully", then click the OK button.