You can now easily import your MBOX file to Yahoo Mail using the eSoftTools MBOX Converter Tool. This tool lets you convert and import MBOX files not just to Yahoo Mail, but also to Gmail, Office 365, and other cloud-based services. Its user-friendly interface makes it simple to use, even if you don't have technical knowledge. You can test the tool by importing up to 25 emails from your MBOX file to Yahoo Mail for free before deciding to purchase the full version for unlimited conversions.
Utilise CubexSoft MBOX Converter for Mac & Windows tool to directly import MBOX file to Yahoo Mail account without any problem. This software can export multiple MBOX files to PST, PDF, MBOX, EML, MSG, DOC, RTF, OLM, CSV, and other items. It supports all MBOX based email clients like Mozilla Thunderbird, Apple Mail, Opera Mail, Eudora, Entourage, and so on. It keeps all the folder structures during the conversion process. There is no file size limitation, one can export a large size of MBOX files without any data loss. Download the free demo version of the program and convert the first 25 items without any cost.