Oversized Outlook data files slow down search, increase crash risk, and can corrupt mailboxes once size thresholds are hit, especially near format limits for ANSI and Unicode PSTs. While Outlook 2013+ defaults to a 50 GB Unicode PST cap (and 20 GB for 2003/2007), admins can adjust caps via registry/GPO; nonetheless, splitting is a safe operational fix to regain performance and reduce ... https://saino7july.medium.com/pst-splitter-tool-comparison-features-limits-pricing-and-support-2025-add0e034dbf2