You can sort the messages in your Inbox under the Saved Mail on Your PC tab and New mail tabs alphabetically by From, Subject, Received, Size, Message icon and Attachment.
To sort your message, do the following:
Click From, Subject, Received or Size to sort the your mail by either the person you received the message from, the subject of the message, the date it was received or the size of the message.
You can also sort using the message Icons in your various folders by read messages, unread message, replied to message, or by Attachment.
Click the appropriate sort option which can be selected in the gray bar at the top of your folder window and the M-Web mail client will display the messages by the selected sort option at the top of the message list.