computerworld.comMicrosoft Office may be the de facto productivity tool for millions of workers worldwide, but it's no monolith. Rather than a single, towering smooth-black Office, there's a whole Stonehenge of options: Office on the iPhone, on iPad, Office on Android smartphones, Office on personal computers, Windows and macOS, Office with a handful of applications, Office with fistfuls'.But when you get down to it, there are really only two kinds of Office. One, which most label Office 2016, is the stand-alone suite that traces its roots back to the last century. (Its successor is Office 2019.) The other, Office 365, is the subscription service that debuted in 2011.How they differ can be confusing, especially since each includes, more or less, the same applications. Here are three top ways to tell these tools apart, and a look at what's coming, based on Microsoft's recently announced new support policies for the upcoming Office 2019, as well as Office 365, down the road.How Office is paid forOf the differences between Office 2016 and Office 365, purchase plans are among the most striking. Office 2016, whether bought one copy at a time in retail or in lots of hundreds via volume licensing, has been dubbed a "one-time purchase" by Microsoft to spell out how it's paid for. (Labels like "perpetual," which has been widely used by Computerworld, technically note the type of license rather than payment methodology, but in Office's case, the kind of license is tied to whether it was bought outright or simply "rented.")Microsoft defines the term as when "...you pay a single, up-front cost to get Office applications for one computer." Up-front is the key adjective there; Office 2016's entire purchase price must be laid out before receiving the software.That purchase, actually of a license to legally run the software, gives the buyer the right to use Office 2016 in perpetuity. In other words, the license has no expiration date, and users may run the suite as long as they want. Pay for Office 2016 this year and use it for the next eight years? Fine. Run it until 2030? Nothing to stop you.One-time purchases include Office Professional Plus 2016 (Windows) and Office Standard 2016 for Mac (macOS), the enterprise-grade SKUs available only via volume licensing; and retail packages such as Office Professional 2016 (Windows) and Office Home and Business 2016 for Mac (macOS). Office 365, the purchase method Microsoft's now pushing most aggressively, is a subscription service, so payments are made monthly or annually. The latter may produce savings in exchange for the commitment: Office 365 Business Premium, for instance, costs $12.50 per month per user when paid in an annual lump sum ($150 per user), but $15 per month per user on a month-to-month plan ($180).All enterprise plans -- from E1 to E5, as well as ProPlus -- do not offer a monthly option, but require an annual commitment. Mentioned in this article Like any subscription, Office 365 provides a service -- in the case of Office, it's the right to run the suite's applications -- only as long as payments continue. Stop paying, and rights to run the apps expire. (Actually, they don't immediately stop working; the applications will continue to operate normally for 30 days past the previous payment's due date.)A license for Office, then, is contingent on sustained payments. Halt the latter and the license is revoked. Restarting the payments restores the license.Office 365 plans range from one for individual consumers (Office 365 Personal) and small businesses (Office 365 Business) to educational institutions (Office 365 Education E5) and corporations (Office 365 Enterprise E3).How each version of Office is servicedAlthough payments define one difference between Office 2016 and Office 365, Microsoft's turn to a faster development and release pace is ultimately more important to users -- and the IT professionals who support them.Think of Office 2016 as traditional software made and sold in traditional ways. That holds for servicing, too. Microsoft provides monthly security updates for Office applications, usually on the second Tuesday of each month, and also fixes non-security bugs for the first five years of the SKU's lifecycle.But Office 2016 does not receive upgrades with new features and functionality. What you get when you buy the suite, feature-wise, is it. When Microsoft produces a new edition, which it will eventually do (and call it Office 2019 or Office 2020, for example), you will need to pay another up-front fee to run that. Office 365, on the other hand, has a completely different servicing model. While the Office applications licensed to users through Office 365 receive the same security patches (and non-security fixes) distributed to Office 2016, they also acquire new features and functionality on a twice-a-year schedule. Three months ago, Microsoft revamped the update calendar, saying it would issue upgrades in September and March of each year. The first is to start rolling out Sept. 12. This support document lists the upgrade release dates through September 2018.As new features and functionality accrete, the applications evolve until, at some point, Microsoft says they are sufficiently different to warrant a new numerical moniker, such as Office 2019 or Office 2020. It will then package those versions into an upgraded suite for customers who continue to make one-time, up-front purchases. (Microsoft has pledged to offer a successor to Office 2016, but has not committed to non-subscription forms beyond that.)How Office hooks up with cloud servicesNeither Office 2016 or Office 365 is truly cloud-based, but both are able to connect with Microsoft's cloud services (and to a very limited extent, some third-party services). Currently, both the applications awarded in a one-time purchase of Office 2016 and those installed as part of an Office 365 subscription can connect with services such as Microsoft-hosted Exchange, OneDrive storage and Skype for Business.However, in April Microsoft announced a major change in the rights of Office 2016's successors to do just. After Oct. 13, 2020, Office applications acquired through an up-front purchase of the suite must be in their "Mainstream" support period, which is the first five years of the traditional guaranteed 10, to connect with Microsoft's cloud services.The change takes aim at customers who mixed cloud services with traditional one-time payment software as it effectively halves the length of time the latter can be used in those organizations. At the same time, the post-2020 rule advances Microsoft's efforts to push, aggressively so, business customers toward Office 365. And the company hasn't been shy about saying so."Office 365 ProPlus is our recommended Office client for Office 365 users," said Alistair Speirs, a senior operations program manager, in an April post to a blog. "This is the Office client that stays up to date with frequent feature releases and ensures the best service experience."Applications obtained from an Office 365 subscription will never have a connect cutoff date.How Office will be supported in the futureOn Feb. 1, Microsoft revealed changes in how it will support Office 2019, the successor to Office 2016 in the "one-time purchase" category, following its release later this year. The company also previewed a shape-shift in support for Office 365, specifically the ProPlus component - the desktop productivity applications - slated to take effect in January 2020.Microsoft plans to slash support for Office 2019."Office 2019 will provide 5 years of mainstream support and approximately 2 years of extended support," wrote Jared Spataro, the general manager for Office, in a Feb. 1 post to a company blog. This is ... to align with the support period for Office 2016. Extended support will end 10/14/2025." As Spataro implied, Office 2016's support also will come to a stop Oct. 14, 2025.Office 2016 is to get 10 years of support (5 in the "Mainstream" support stretch, 5 in "Extended"). Office 2019 will get just 7, representing a decrease of 30%. Because Office 2019's Mainstream support will presumably end sometime in October 2023, that will be the cut-off for connecting Office 2019's applications to Microsoft's cloud services (see the section "How they hook up with cloud services," above).Office 2016's and 2019's simultaneous retirement is the strongest signal yet that Microsoft will shut down the one-time purchase option after Office 2019, finally making the subscription-based Office 365 the only way to license the productivity applications.Spataro dropped other clues about Office's future. "It has become imperative to move our software to a more modern cadence," he wrote, implying that years of support for perpetually-licensed software was either onerous for Microsoft or put customers at risk (or both).Along with the reduction of the support timeline, Microsoft also announced that Office 2019 would be supported only on Windows 10. Even though Windows 7 will have more than a year left before retirement when Office 2019 debuts, and Windows 8.1 will have over four years remaining, Office 2019 will not be supported on those operating systems.Meanwhile, Office 365's ProPlus will see its support curtailed, too.The new policies stake out Windows 10 as the only supported edition of Microsoft's OS as of January 14, 2020, the head-to-assisted-living date for Windows 7. Windows 8.1 will also be unsupported by Office 365 ProPlus, as will the Windows 10 LTSC (Long-term Servicing Channel) version.In other words, Office 365 subscribers running Windows personal computers have less than two years to upgrade to Windows 10 if they're to continue working with the suite-by-subscription."This will ensure that both Office and Windows receive regular, coordinated updates to provide the most secure environment with the latest capabilities," said Spataro, echoing the rationale his employer has given numerous times when it's tied Office and Windows together.

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