I have a large number of emails stored in MBOX format from an email client, such as Thunderbird. Now I need to migrate these emails to IBM Lotus Notes (NSF format) for official use. The main concern is data integrity. I do not want to lose email content, attachments, folder structure, or metadata during the conversion. Is there any safe and reliable way to convert MBOX emails to NSF without data loss? Please suggest a proper solution.