Outlook by default openes the "Inbox" when you open Outlook. You can change to a different forlder to start if you have a different preference. Please see below for details:
Step 1: Click the "File" tab from the ribbon;
Step 2: Click "Options" button in the tab;
Step 3: Click "Advanced" from the left navigation bar and click "Browse" next to "Start Outlook in this folder"
Step 4: Select a folder as the default startup folder, e.g., "Sent Mail" folder. Click "OK" to close the window.
Step 5: Click "OK" to close the "Outlook Options" window.
Close Outlook and re-open it, the startup folder now is "Sent Mail" folder.
