If you're dealing with oversized Outlook PST files, splitting them into smaller files is definitely a good practice to improve Outlook performance and reduce the risk of corruption. One option that's worked well for bulk PST management is the DRS Softech Outlook PST Splitter. It lets you split PST files by size, date, folder, or email ID while preserving the original folder hierarchy and metadata. It also supports both ANSI and Unicode PST files and offers a demo version if you want to evaluate it first.