Click the reel to reel tape recorder icon to connect to your voicemail box. Once connected, enter your VM numerical password.
If you have unchecked voicemail messages, you will see the number of new messages appear in a red dot, as part of the reel to reel tape recorded icon.
Your new voicemail messages count will also appear in the application icon (up to 99 VM messages).
The Voicemail Map is below.