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- 2025-12-02 08:42
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- New York City
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How to split Outlook PST file is a common question for users facing oversized or slow mailboxes. The easiest options are using Outlook’s built-in features or a professional PST splitter tool for large or multiple files.
You can manually split a PST by:
- Creating a new Outlook Data File (.pst) from File > Account Settings > Data Files, then moving or copying folders into it to reduce the original file size.
- Using File > Open & Export > Import/Export to export selected folders to a new PST, repeating the process by date or folder to create several smaller files.
Alternatively, specialized PST splitter software lets you break large PSTs by size, date, year, folder, or email ID with less risk and effort, which is ideal when Outlook is slow, unstable, or the PST is close to the size limit.
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