My Outlook PST file has grown very large, and Outlook is now running slowly. I want to reduce the size of my PST file, but I’m worried about losing important emails and folders. What is the safest way to manage and shrink a large Outlook PST file?

It's time to manage and reduce your Outlook data file if Microsoft Outlook is running slowly, hanging frequently, or your PST file has grown a lot. Large PST files not only impact performance but also increase the risk of corruption. Fortunately, you can safely shrink them without losing your emails.

I'd like to share a small experience. My Microsoft Outlook PST file had grown to approximately 20 GB, causing Outlook to become very slow and freeze frequently. I tried compacting it manually, but it didn't work. Then I tried the DataVare Outlook PST Compact Expert. This tool reduced the size of the PST file without deleting any emails or attachments. The process was quite easy & required no technical skills. After using the tool, Outlook's speed improved & the hangs were reduced. If someone's PST file has become very large & is experiencing performance issues, this tool can be a good option.

Blog: https://www.datavare.com/how/reduce-outlook-pst-files/