I am facing an issue with slow Outlook startup on my Windows PC. My PST file has grown quite large over time because I receive a lot of emails with attachments, and now Outlook takes a long time to open and load everything. I have already tried deleting unnecessary emails, but the PST size is still big. I have heard that compressing or compacting the PST file can help improve Outlook’s performance, especially during startup. Can anyone suggest the best and safest ways to compress or compact a PST file for faster Outlook startup?