Either there is no default mail client outlook 2013 windows 7

A classic issue!

By default, Outlook 2013 does not set itself as the default mail client on Windows 7. This means that when you click on a mailto link or try to send an email from another application, Windows will not automatically open Outlook 2013.

To set Outlook 2013 as the default mail client on Windows 7, follow these steps:

1. Open Outlook 2013.
2. Click on the "File" tab in the top left corner of the Outlook window.
3. Click on "Options" in the left-hand menu.
4. Click on "Advanced" in the left-hand menu.
5. Scroll down to the "General" section.
6. Click on the "Default email client" dropdown menu and select "Outlook 2013".
7. Click "OK" to save the changes.

Alternatively, you can also set Outlook 2013 as the default mail client through the Windows Control Panel:

1. Go to the Start menu and type "Default Programs" in the search bar.
2. Click on "Default Programs" to open the window.
3. Click on "Associate a file type or protocol with a program".
4. Scroll down to the "Email" section.
5. Click on the "Set default" button next to "Email client".
6. Select "Outlook 2013" from the list of available email clients.
7. Click "OK" to save the changes.

After setting Outlook 2013 as the default mail client, you should be able to open mailto links and send emails from other applications using Outlook 2013.