How to Import PST to Yahoo Mail with large file size (50GB+)?

To import PST to Yahoo Mail with large file size (50GB+), the manual Outlook method can be very slow and unreliable because it uploads emails gradually via IMAP. Large PST files often cause syncing issues, timeouts, or incomplete transfers.

If you still want to try manually, first split the large PST file into smaller parts using Outlook’s archive feature. Then, import each smaller PST into Outlook, add your Yahoo Mail account via IMAP, and move emails in batches. This reduces the chances of errors but still takes a lot of time and effort.

A faster and more reliable way is to use a tool like the SysInfo PST Converter Tool. It can handle large PST files without size limitations and allows batch processing. You just add the 50GB+ PST file, preview the data, and select Yahoo Mail as the destination. The tool transfers emails, attachments, and folders in bulk while maintaining structure and preventing data loss.
 
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