If you want to keep using Office and have Office 365 you need to connect to the internet every 3 days or so otherwise the activation deactivates itself. If you are in an office then the enterprise or volume editions don have this feature. You can buy Office 216 outright and this activates with a serial number and only requires an internet connection if you want to install updates. If you are fed up with Microsoft and want something open source and free or almost free that looks and works almost exactly the same as office but is not Microsoft have a look at Kingsoft WPS Office s nI used this for about 6 months as I was looking for an alternative and didn really enjoy the OpenOffice experience. LibreOffice is another option people often rmend I used it briefly but preferred the interface of WPS Office as it was more similar at the time. It has been improved since but I don like it icons as much as the original ones used in Microsoft and WPS Office. The only quirk that bothered me with WPS office is if you want to save as PDF there are limitations on what it allows with the free version and uses a watch this ad to unlock PDF functionality for 3 mins business model. I have gone back to using Office 365 Home edition now due to having 5 licenses which is convenient for the number of machines in our household.