There are following setps perform:
Step:1 On the Start menu, click All Programs > Accessories > Run.
Step:2 Type the outlook.exe /resetnavpane command and click OK.
Step:3 Restart your computer
Step:1 On the Start menu, click All Programs > Accessories > Run.
Step:2 Type the outlook.exe /resetnavpane command and click OK.
Step:3 Restart your computer