Are there size limits when joining several PST files into one?

DeniseSmith

New member
Jul 2, 2025
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Yes, there are size limits when you combine multiple PST files into one, especially if you do it manually in Microsoft Outlook. If you make a new PST and copy data from several files into it, the new file will still have to follow Outlook PST size limits. For example, older ANSI PST files can only hold 2GB, while newer Unicode PST files (used in modern versions of Outlook) can hold up to 50GB by default. Going over or getting close to this limit can cause problems with performance or even corruption. GainTools Merge PST Tool is a professional solution that makes it easier for users to combine multiple PST files. The tool lets users merge into a new PST and helps them manage large amounts of data without changing the original files, which reduces the risk of size- related errors.