I always warn people for their dependency on provider e-mail services. The risk is when you change provider, you lose all your valuable e-mails in a jiffy. Enter Mailstore Home: This software (free for personal use) allows you to connect to your various mail servers, and archive the messages in a local store (in fact (sadly) it refused to create a store on my NAS). From that moment on, your e-mail messages are yours again! You can search them, view them anytime. No matter if your mail server crashes, is unavailable, or even if you have no internet connection: You have your e-mail.