Office 2010 suites include applications such as Word, Excel, PowerPoint, and Outlook; they are available as a one-time purchase for use on a single PC.
Office 365 plans also include the applications plus other services that are enabled over the Internet, including online storage with OneDrive and Skype minutes for home use. With Office 365 you get the full, installed Office experience on PCs, Macs, tablets (including iPad® and Android™ tablet) and phones. Office 365 plans are available as a monthly or annual subscription.
Yes. Documents that you have created belong fully to you. You can choose to store them online on OneDrive or locally on your PC or Mac.
If you have an active Office 365 Home subscription, you can share it with up to four members of your household. Each household member you share your subscription with can use any of your available installs on their PCs, Macs, iPads, Android tablets, Windows tablets, iPhones® or Android phones, get an additional 1 TB of OneDrive storage, and manage their own installs from www.office.com/myaccount.
To add someone to your subscription, visit www.office.com/myaccount and follow the onscreen instructions to add a user. Each person you add will receive an email with the steps they need to follow. Once they have accepted and completed the steps, their information, including the installs they are using, will appear on your My Account page. You can stop sharing your subscription with someone or remove a device they are using at www.office.com/myaccount.