If you want to create a distribution list in Windows Mail, here's what you need to do:
1. Start by opening up Windows Mail and click on the Contacts icon in the left-hand sidebar. This will bring up your contacts list.
2. Next, click on the New Contact Group button near the top of the window. This will open up a new window where you can start creating your distribution list.
3. In this new window, give your distribution list a name and then begin adding contacts to it by clicking on the Add button. You can add contacts one at a time or you can import them from another file such as an Excel spreadsheet.
4. Once you've added all of the contacts you want to include in your distribution list, click on the OK button and then close out of the windows.
Now when you go to compose a new message in Windows Mail, you'll see your distribution list as an option in the To: field and you can simply select it instead of having to type out each individual email address every time