Office Online Server for Office LTSC 2021 customers
There isn’t a new version of Office Online Server for Office LTSC 2021. But you can use the existing version of Office Online Server, which you can download from the Volume Licensing Service Center (VLSC).
In the VLSC, you can download Office Online Server from the product page for Office Professional Plus 2019 or for Office Standard 2019. From the Download tab on the product page, select Continue to see a list of Office Online Server .iso files for all the available languages.
You can download language packs for Office Online Server from the Microsoft Download Center.
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