Article in English: Go to https://www.outlook.com/ in any web browser on your computer. This will open your Outlook inbox if you're logged in. If you aren't logged in, click Sign in if necessary, then enter your email address and password when prompted. Click the grey "Try the beta" switch in the top-right side of the page to do so. If you see a dark-blue switch that says "Beta" here instead, you're using the beta. It's in the top-left corner of the page. A pop-up window will appear. Click the "To" text box at the top of the pop-up window, then type in the email address to which you want to send an email. Click the "Add a subject" text box, then type in whatever you want to use for the subject. The subject is typically used to give the recipient an idea of what the email will be about. Click the text box below the "Subject" text field, then type in your email's body.  You can highlight a piece of text in your email and then click one of the formatting options (e.g., B to bold) at the bottom of the window. If you want to add photos or files to the email, click the paperclip icon or the "photos" icon at the bottom of the window and then select an option. It's a blue button in the bottom-left corner of the pop-up window. Doing so sends your email to the specified recipient. If you download the Outlook email app for your iPhone or Android, you can use it to send emails:  Open the Outlook mobile app. Tap the "Compose" icon (or on Android). Enter your recipient's email address in the "To" text box. Enter your subject in the "Subject" text box. Enter your email body in the large text box. Tap the paperclip icon and select a file option if you want to attach a photo or file. Tap the "Send" icon in the top-right corner of the screen to send your email.

Summary in Vietnamese:
Mở Outlook. Đảm bảo bạn đang dùng bản beta. Nhấp vào ＋ New message (Thư mới) ở phía trên góc trái trang và bạn sẽ thấy xuất hiện một cửa sổ mới. Nhập địa chỉ email của người nhận. Nhập tiêu đều. Viết email. Nhấp vào nút Send (Gửi) màu xanh dương ở bên dưới góc trái cửa sổ đang hiển thị để gửi email đến địa chỉ đã nhập trước đó. Gửi email từ ứng dụng Outlook.