If you exit Thunder, and there is no prompt to choose between entering travel mode or not, you will need to create a subscription in the Exchange Agent.
Click the tray icon on the Windows taskbar. This will show all icons in the tray, including the Exchange Agent.
Hover over the Exchange Agent icon and right-click. Select "Options" from the choices.
Select the "Replication" tab. The circle between Create and Drop will be Red. Select "Create"
A window will pop up to let you know the subscription has been created. When you click okay, the circle will turn Green.