If you cannot find the Mail icon in the control panel, it may be hidden in the view you are using.
In the upper right corner of the Control Panel window, click View by: Category and select Small icons. The mail icon should now be present.
Note: If you are using a 64-bit version of Windows 7, the mail icon will be listed as Mail (32-bit).
In the left-hand panel, click Switch to Classic View. The mail icon should now be present.
If you are using a 64-bit operating systems, click on View x86 Control Panel Icons located in the left column. The mail icon should now be present.