How to Split Large PST Files Without Losing Outlook Data As your Outlook mailbox grows, it accumulates thousands of emails, attachments, and calendar invites. This data is stored in a Personal Storage Table (.pst) file. When a PST file gets too large, Outlook performance degrades significantly. It can cause software freezes, slow search indexing, and even trigger file corruption that leads to complete data loss.
Splitting an oversized PST file into smaller, more manageable chunks resolves performance bottlenecks while preserving your critical mailbox hierarchy and data integrity. Method 1: Use the Archive Feature (Native Method)
The safest built-in tool to reduce PST size is Outlook’s Native Archive feature. This method relocates older emails to a brand-new PST file based on a specific cutoff date. Step-by-Step Instructions: How can I split 20 GB PST file – Spiceworks Community
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