I am facing an issue while trying to migrate my email data from Mozilla Thunderbird to IBM Lotus Notes. I have a large number of important emails stored in Thunderbird (MBOX format), and my organization recently switched to Lotus Notes, which requires the data in NSF format. I tried searching online, but did not find any reliable manual method to convert MBOX to NSF directly. Lotus Notes does not seem to provide any option for importing Thunderbird mailboxes either. Can anyone suggest a working method or tool to safely convert Thunderbird MBOX files into NSF format without losing data like attachments, folders, or email formatting?