I recommend using the Softaken Maildir Converter when attempting to convert Maildir to PST format. It is a reliable tool that efficiently manages the conversion process without compromising the folder structure or causing any data loss.

I found the following features to be particularly beneficial:

• Converts Maildir/Maildir++ files to PST and other formats, including MBOX, EML, and MSG.
• Maintains the properties and attachments of emails.
• Enables bulk conversion, which significantly reduces the amount of time required.
• A user-friendly interface--ideal for individuals who are not particularly tech-savvy.

Additionally, there is a demo version available for testing to determine its functionality prior to purchasing the full version. It was certainly beneficial to me when I encountered the same problem.