Microsoft (MSFT [1], Fortune 500 [2]) is offering Office as a subscription service for consumers, CNN Money reports. For $100 a year, “Office 365 Home Premium” customers can put Office on up to five computers (including Apple (AAPL [3], Fortune 500 [4]) Macintoshes and Windows 8 tablets [5]) and store up to 27 gigabytes of data on Microsoft’s SkyDrive cloud storage service. The subscription includes frequent software updates and allows users to automatically load their customized Microsoft Office settings on each different device. Office 365 users will also be able to get “Office on Demand,” a feature that allows them to temporarily access the latest version of Office on any computer through a Web browser — whether or not that device has the program installed. One caveat: Once you stop paying, you lose the software…