Office Online Server – Error Microsoft Office 2016 requires Universal CRT (KB2999226)

Hello Readers

When deploying Office Online Server today, I ran into a error when trying to install the media via the mighty Pat Richard script and running the setup executable manually.

Setup is unable to proceed due to the following error(s):
– The installation of a Microsoft Office Online Server Language Pack requires that Microsoft Office Online Server be installed.
– Microsoft Office 2016 requires the Universal CRT (KB2999226) which failed to install.
Correct the issue(s) listed above and re-run setup.


The KB referenced above has two dependancies which will need to be checked or addressed before install KB299226

Install this KB2919442 first –

Install this KB2919355 second –

Please be aware this KB will take a long period of time to install as its nearly 700mb. You maybe prompted to restart the server after install, please restart then continue to proceed.


Install KB299226

This completes all the required steps for Office Online Server KB prerequisites and you will now be able to install your OOS Farm successfully.

Andrew J. Price

3 thoughts on “Office Online Server – Error Microsoft Office 2016 requires Universal CRT (KB2999226)”

  1. Hi – Thanks for sharing above info.

    Would you mind sharing the entire install process of Office Online Server including external certificate process?



Leave a Reply

Your email address will not be published. Required fields are marked *