My Outlook mailbox has grown very large and is taking up too much space on my system. I have already deleted unnecessary emails and emptied the Deleted Items folder, but the PST file size has not reduced much. Can anyone guide me on how to free up space in Outlook by compacting the PST file safely without losing any important emails or data? Also, is there any option in Outlook for this, or do I need to use some third-party tool?