Microsoft Announces Preview of Office LTSC for Windows and Office 2021 for Mac Apr 23, 2021 12:41 GMT Office 2021 is the next perpetual version of the suite Microsoft has recently confirmed that Office 2021 is the next perpetual version of its famous productivity suite, and while the company still hopes everybody would make the switch to its subscription-based service, it still wants to help those needing the traditional Office suite to stick with its product. This week, Microsoft officially announced the commercial preview of Microsoft Office Long Term Servicing Channel (LTSC) for Windows and Office 2021 for Mac, which is specifically aimed at computers without Internet access and which can’t be updated on a regular basis.