Can I export a large DBX mailbox to PST without import failure?

My DBX file is large, and the normal import process stops or hangs. The mailbox has years of old business emails, so I need a better way to export it into PST without losing messages or breaking the mailbox structure.
My DBX file is large, and the normal import process stops or hangs. The mailbox has years of old business emails, so I need a better way to export it into PST without losing messages or breaking the mailbox structure.

A large DBX mailbox can be exported to PST but it should not be handled like a normal small mail folder. Large DBX files may fail during manual import because Outlook Express data is old and newer Outlook versions do not read DBX files directly.

Use a copied DBX file for testing and keep the original mailbox backup safe. Also make sure the destination drive has enough free space before creating the PST. After export, check random emails from the start, middle and end of the mailbox to confirm dates, attachments and folder order.
For large Outlook Express mailboxes, GainTools DBX to PST Converter Software gives a safer way to scan selected DBX files, preview emails, and save PST output locally instead of forcing a manual import.

Start with the free demo and test 10 emails from each DBX folder before converting the complete mailbox.