{"id":562,"date":"2026-06-17T10:38:14","date_gmt":"2026-06-17T10:38:14","guid":{"rendered":"https:\/\/www.macsonik.com\/blog\/?p=562"},"modified":"2026-06-17T10:39:14","modified_gmt":"2026-06-17T10:39:14","slug":"split-large-pst-files-into-smaller-files","status":"publish","type":"post","link":"https:\/\/www.macsonik.com\/blog\/split-large-pst-files-into-smaller-files\/","title":{"rendered":"Split Large PST Files into Smaller Files: Complete Guide (2026)"},"content":{"rendered":"\n\n
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User-Query:<\/strong><\/p>\n

“My Outlook PST file has grown to about 48 GB<\/strong> over the past few years, and Outlook has started becoming slow. I see that my ‘Outlook is not responding’<\/strong> messages. My mailbox contains roughly 180,000 emails<\/strong>, including large attachments. I want to split large PST files into smaller files without causing corruption<\/strong>. What’s the best way to do it?”<\/p>\n

— Asked by ‘Jonathan Reed’<\/strong><\/p>\n<\/div>\n

Introduction:<\/strong> Microsoft Outlook uses a PST file to store mailbox data such as emails, contacts, calendars, notes, tasks, and attachments. Over time, as mailbox data increases, PST files can become oversized, making Outlook slower and increasing the risk of corruption. Large PST files often lead to performance issues, delayed searches, and even file access errors. Splitting a large PST file into smaller ones is the best way to improve mailbox management. This guide outlines the effective methods to split PST file into smaller parts in 2026. Moreover, it also covers the MacSonik <\/strong>PST Splitter Tool<\/strong><\/a> for quick processing.<\/p>\n

Download Now<\/a> Purchase Now<\/a><\/div>\n
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Table of Contents<\/p>\nToggle<\/span><\/path><\/svg><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n