By purchasing this electronic license, you will receive a monthly subscription to the official Microsoft Exchange add-on, called the Online Kiosk. Compared to the original version of Microsoft Exchange, it reduced the capacity of the e-mail box (now max. 1 GB), but allowed more flexible online access via a web application. So if you have employees in your company for whom high e-mail capacity is not a priority, then Microsoft Exchange Online Kiosk is the right choice.