If you want to access your old MBOX email files in Zoho Mail, there are simple ways to make it happen. Since Zoho Mail doesn’t support direct MBOX import, you’ll need to follow either a manual method or use an automated tool. Both methods are explained in detail in this blog — 
Simplest Method to Import MBOX to Zoho Mail in 2025.
The manual method involves using Mozilla Thunderbird to import your MBOX files first, and then setting up your Zoho Mail account through IMAP. Once connected, you can drag and drop the imported emails to Zoho Mail folders. While this method is free, it can be lengthy and requires a bit of technical setup to ensure no data is lost during the transfer.
For a faster and error-free approach, you can use the 
Cigati MBOX Converter Tool. This professional solution automates the entire migration process by converting your MBOX files into Zoho-compatible formats and directly importing them. It also preserves attachments, folder hierarchy, and email formatting, ensuring a smooth transfer without any manual effort.
The Migrate Cloud Data blog covers everything you need — from preparation steps to troubleshooting tips. Whether you’re migrating personal mailboxes or multiple business accounts, this guide ensures that your emails move securely and efficiently.
In conclusion, while the manual process works for small data sets, using the Cigati MBOX Converter is the most reliable and time-saving option to import MBOX files to Zoho Mail successfully in 2025.