Compress your Outlook PST file by using "Compact Now" feature of Microsoft Outlook. But, the size of your PST file is quite large so please don't take any risk with your important Outlook data files. I mean to say that you should go with any third party software. I would like to give you two better solution on the behalf of my personal experience. First is obviously Compress your PST file and the second one is PST Compact and Compress Tool.
Learn more info, here:- Compact Outlook PST Files.

 

Hello

If anyone looking for the best tool to break the large PST files then I would suggest trying to use the KDETools PST Splitter. It has various Featured are:

1. This tool reduces the PST files by Date.
2. This tool reduces the PST files by Size.
3. This tool reduces the PST files by Year.
4. This tool reduces the PST files by Folder.
5. Support in ANSI and also UNICODE formats.
6. Split the PST files without installing MS-Outlook.
7. Split the Windows Version and Outlook Version.

More Details: Split PST Tool to Divide/Split Large Outlook PST File into Smaller Parts

 

Compact PST software safely reduces the size of large Outlook PST data files by compressing them. It is extremely well designed to compact extra-large Outlook PST data files to avoid any type of corruption and to save space in the hard drive of the system. This application does not alter the contents of Outlook PST files. Softaken Compact PST Software enables a user-friendly GUI appearance with advanced algorithms. This utility supports all MS Outlook and Windows OS versions.

 

To compact PST file without opening Outlook installation, you should use one of the best and safest RecoveryTools PST Splitter Tool. the software comes with amazing and advanced features such as it supports all types of Outlook profiles and PST files exported from any Outlook version. To know more about the software visit the given USL and download the free version of this software.