Can I convert OST to PST with large mailbox files over 50GB?

Yes, you can convert OST to PST with large mailbox files over 50GB, but you should avoid manual methods. Microsoft Outlook itself may struggle with very large OST files, and exporting them directly can cause freezing, corruption, or incomplete data transfer.

The safer and more practical way to convert OST to PST when dealing with large mailboxes is by using a professional converter tool designed to handle bulk and oversized files. Tools like SysInfo OST to PST Converter are built to process large OST files without size limitations. They scan the entire mailbox, maintain folder hierarchy, and preserve emails, attachments, contacts, calendars, tasks, and other data without modification.

For large files (50GB+), here are important precautions:

1. Use a system with sufficient RAM (16GB recommended) for smooth processing.
2. Enable the Split PST option to divide the output into smaller PST files (for example, 5GB or 10GB each). This prevents PST corruption and improves performance.
3. Avoid running heavy background applications during conversion.
4. Always keep a backup of the original OST file before starting.