If your Outlook PST file is too large for a destination then you can go with either manual or professional approaches. I recommend you use Outlook PST Splitter Tool, which is a professional tool. It splits or divides your large PST files into smaller parts without needing to install MS Outlook on your local device. The tool has a feature to split all PST with attachments. You can follow the given steps for splitting your PST.
The best technique for compressing PST files. I suggest using the DataVare Outlook PST Compact Expert Program. This application can compress both ANSI and UNICODE PST files. With this utility, you can compress PST files without losing any data. Furthermore, this program is compatible with Windows 11, 10, 8.1, 8, 7, XP, Vista, and earlier versions. Use the most recent version of this program to receive a free trial.
It's easy to compress a PST file. I recommend the Softaken Compress PST Tool. Using the removal of extra data and cache space, the application can handle compressed PST files of any size. With this application, you can compress PST files without losing any data. Additionally, this software is compatible with Windows 7, XP, Vista, 8.1, 8, 10, and 11. Install this application's most recent trial version to test it out for free.