It appears that you have provided a block of text and a key-value pair. The key is 'MailStore Server 13.2.1.20465 / Home 23.3.1.21974 free download', and the value is the given text.

Based on this information, I can provide some insights about MailStore Server and Proton Mail.

Firstly, MailStore Server is a software solution that provides email archiving for small to medium-sized businesses. It offers features such as secure email storage, easy installation, support for virtual environments, and improved support for cloud services and modern authentication.

Secondly, Proton Mail is a private email service that uses end-to-end encryption and zero-access encryption to secure communications. This means that even Proton cannot access the user's inbox, making it an attractive option for those who prioritize data privacy.

Lastly, MailStore Server has released several new versions, including V13.2, which offers improved performance and support for businesses with up to 2,000 users.

If you're interested in downloading a free version of MailStore Server, I can help you with that!