This product is a part of the Microsoft Open License program and thus requires a LAN or License Access Number. If you do not have an existing LAN, Microsoft requires the purchase of 5 compatible licenses to generate the LAN. (Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Skype) Email with 50 GB mailbox 1 TB file storage and sharing HD video conferencing Fully installed Office on PC/Mac Office apps on tablets and phones