Follow the below steps to compress Outlook data files without losing any data.
Step-1
Visit the official website of DRS Softech and download the Compress Outlook Data Files. Install the application and run it as administrator.


Step-2
Expand the Choose file type field and select the Outlook data file type: PST or OST.
Step-3
Click on the Next button to proceed further.


Step-4
Now, you will see two different options in the left pane to add files: Select Files and Select Folder. The Select Files option allows you to add individual files, while the Select Folder option assists you in adding an entire folder.
Step-5
Click the Select Files option to add the desired Outlook data file.


Step-6
Locate the Outlook data file you want to compress. Select it and hit the Open button.
Step-7
Now, you will see the desired file has been added to the application. You can remove any item from the list using the Remove and Remove All buttons.


Step-8
Click the Next button to proceed to the next step.
Step-9
You will see the preview of the mailbox items of the selected Outlook data file. Tick the mailbox folders that you want to compress. Hit the Next button.


Step-10
In the Compression Option Panel, choose from the following options.
- Compress All Attachments in New PST File
- Remove All Attachments from the new PST File
- Remove All Attachments in a new PST File and save them in a Separate Folder
- Remove All Attachments in a new PST File and compress them in a Separate Folder.
Step-11
After that, enable the Remove Duplicate Mail based on the option and select the parameters: To, From, Subject, Bcc, and Body.


Step-12
Next, select the Date Filter feature and enter appropriate dates in the Start Date and End Date fields.
Step-13
If you want to break the resultant PST file into multiple smaller files, tick the Split Resultant PST File option and define the size of the resultant PST files.


Step-14
Click the Path to Save button and specify the saving location for the resultant file.
Step-15
At last, click on the Start Compression button to initiate the Outlook data file compression.


Step-16
The application is compressing the selected Outlook data files. The process will take some time depending upon the size of selected files.
Step-17
After the process has been completed, you will see the report of the process. Press the Download Report button to download this report.


Step-18
Also, if you want to compress other Outlook data files, press the Convert Again button.