Office LTSC and Office 2021 for Mac are now available for commercial preview Apr 22, 2021 13:16 EDT with 6 comments Microsoft has announced that the next "perpetual" version of Office, called Office Long Term Servicing Channel (LTSC) for Windows and Office 2021 for Mac, is now available for commercial preview. Microsoft announced the next version of the perpetual license version of Office back in February and promised a commercial preview in April, so things are lining up well. The Office LTSC releases are different from Microsoft 365 (previously Office 365), because they require a one-time purchase, but that also means they never get any new features until the next perpetual license release. Additionally, you get five years of mainstream support, but after that, it's over, while Microsoft 365 subscribers get continuous support and new features added as long as their subscription is active.