Occasionally, it might be necessary to stop the gateway to perform maintenance on the Windows machine or for some other purpose. When you stop the gateway, any messages being sent from GroupWise users are queued in one of the domain\wpgate\exchange\wpcsout\ngaxxxx\0-7 directories. Messages sent from Exchange users are moved to the gateway's mail store. The messages waiting in each system are processed as soon as the gateway is started again.
Follow the instructions for the installation option you chose for the Exchange Gateway:
At the Exchange Gateway console, click Start > Settings > Control Panel.
Double-click Services.
Select the Exchange Gateway service, then click Stop.
Recall that the Exchange Gateway Service is named after the domain and gateway.