\No Activity\" Notification"

Hi Dina.

I would start with a site workflow that checks the list on your desired schedule (hourly, daily, weekly, etc.).  In the workflow, you would perform a date calculation to get today's date minus 30 days and store that result in a workflow variable.  Next perform a Query List action to get a collection of list items whose Modified date is greater than or equal to 30 days (filter using the workflow variable). Then loop through each item in that collection and configure a notification to be sent.

Thanks Eric, this helps.  I hadn't considered running a site workflow for this.  Thanks again!