1. Check your email account. If there are messages older than a month, and you still haven’t read them, chances are, you won’t. Delete them.
2. If you have old emails with important attachments, save the attachments to your computer, or an external drive, and delete those messages.
3. Check your email account’s options. You will have the option to create either folders or labels, depending on your email program’s options, and you can archive old messages. Use these options, and move your most important messages into appropriate categories.
4. Go through each and every message. If you know you won’t read or need the message again, delete it. If the email message contains a joke, don’t worry – at least three other people will send you that same message again. If you have messages that you keep promising yourself you’re going to read someday, chances are, you’ll never read them. Delete them all.
5. Once you have your inbox under control, make it a habit to either file, or delete, messages as soon as you get them. If you make this a daily habit, your inbox will remain under control.
Read more: How to keep a tidy Inbox| eHow.com