Step 1: Start Outlook
Step 2: Choose File >> Account Settings >> Account Settings
Step 3: Select your Exchange accountÂ
Step 4: If prompted, in the Password: text box, type your password
Step 5: Click the Change button
Step 6: Click the More Settings button
Step 7: Select the Security tab
Step 8: Select the "Always prompt for logon credentials" check box
Step 9: Click OK,
Step 10: Choose Close