Can the Microsoft OST to PST Converter handle large OST files?

[henrypit74]

Yes the Microsoft OST to PST Converter can handle large OST files but with some limitations. In Outlook the built-in export feature allows users to convert OST to PST but it may struggle with large files due to performance issues and corruption risks. For smoother conversion of large OST files it is recommended to use professional tool like WholeClear OST to PST Converter which are designed for handling large OST files without data loss. It includes features like selective export and enhanced speed making them more suitable for enterprise-level OST file conversion tasks.

[jackdanie]

Microsoft doesn’t provide a built-in OST to PST Converter. The only native option is Outlook’s Import/Export feature, which works only if the OST is healthy and linked to its original profile. For very large OST files, this method often fails or takes a long time.

To handle large or orphaned OST files, a professional tool like BLR OST Converter is recommended. It’s designed to process oversized OSTs smoothly, without data loss, and preserves emails, attachments, contacts, and calendars.

In short, Outlook alone struggles with large OSTs—specialized converters are the safer choice.