If you want to convert NSF files to MBOX, use the reliable
TrustVare NSF to MBOX Converter. When you convert NSF files to MBOX, this tool will secure all data, emails, contacts, calendars and attachments. You need to install Lotus Notes on your PC before you can convert. To get started, simply download and install the tool, add NSF files to MBOX, select the desired save location, preview the file before conversion, and then initiate the conversion. Additionally, the tool works with Windows 11, 10, 8.1, 8, 7, XP, and Vista. And it supports multiple email clients like Thunderbird, Apple Mail, Windows Live Mail and more. The tool supports batch processing and guarantees data loss. It also offers a free demo version.
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https://www.trustvare.com/nsf/mbox/