It can be combined with rules as a pre-condition. For example: I have a CC box where mail is moved to where I am in CC. As I am mentioned in CC, I do not expect immediate action is required, and I will postpone the activity of reading or other action for that mail and 999 out of 1000 times it will resolve itself. Now this is a very easy and clear example of a rule, but there are many like this to manage the workload to manageable levels. It allows me to work part-time for multiple customers, while often being more productive then full time employees.