Why do you ask on a Thunderbird forum about using Windows Mail? Thunderbird is an email client. It is not an "email provider". It's a tool for working with multiple email accounts, along with newsgroups, RSS feeds, all in one place and so with a consistent user interface. It isn't, of itself, going to offer you an account nor a server to manage your communications. Use POP if you don't want any storage on the internet. You can use IMAP but you'll need to find out how your chosen client supports downloading to a local store and then deleting from the server. In Thunderbird this is achieved by use of the Local Folders account. I'm not sure that Microsoft's email clients make such a clear distinction about where messages are stored. What do you want from "end-to-end" encryption? Most reputable email clients offer s/mime, as does Thunderbird. Thunderbird also offers gpg via the Enigmail add-on. These systems are only useful if both sender and recipient agree to use the same system, and have keys and have exchanged public keys. Please don't imagine that SSL or TLS as normally used in email offer end-to-end encryption. These are used only to protect your login credentials. Whatever email client you use, webmail is pretty much always available for ad-hoc access to your email, though if you choose to keep the server clean, it will show only current messages.