Following the procedure below will change the polling period from every
1,000 seconds to every 30 seconds.
1. Go to the server where the e-mail router is installed.
2. Go to C:\Program Files\Microsoft CRM Email\Service
3. Edit the file Microsoft.Crm.EmailAgent.xml with Notepad
4. Find the element SchedulingPeriod
5. Change the value (most likely currently 1000) to 30
6. Restart the Microsoft CRM Email Router service