Andrea has been our bookkeeper for 10 years. She is regularly controlling the outstanding payments, as well as our financial performance and status. At the end of each fiscal period, she is also in charge of closing financial periods and books. Today Andrea needs to check outstanding payments. Finding service invoices still open for more than one month, she needs to take action. Some loyal customers, she would like to call in person, while for others, a polite reminder through e-mail will suffice.