My main PST crossed 45GB and Outlook has become painfully slow with random hangs. I want to split it into smaller files, ideally by year, without losing folder structure. Built-in archive keeps timing out.
How to divide a large PST file into smaller parts?
Solved Email & Outlook
RK
Rachel Kim October 25, 2018
2 replies
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Reviewed by moderators
Past 40GB most Outlook versions get unstable, so splitting is the right call.
1
Use SysTools Split PST. It divides by size, year, folder or sender.
2
For your case pick split by year. Each output PST keeps the original folder tree.
3
Attach the year files you actually need in Outlook and archive the rest to storage.
45GB by year should produce 6 to 8 healthy sized files and the slowdown disappears once your live PST drops under 10GB.
Split into 7 yearly files. Outlook opens instantly again. Solved.