How to install and upgrade Office Online Server to the latest version


Office Online Server (OOS) is the next generation of Office Web Apps Server (OWA), which allows organizations to deliver browser-based versions of Word, PowerPoint, Excel and OneNote, among other capabilities.

Office Web Apps Server is not supportable for Windows Server 2016.

Most people who need to run Office Online Server are having Skype for Business Server 2015/2019 or SharePoint. Within Skype for Business it will be used for PowerPoint presentations inside meetings.

You can download Office Online Server from MSDN or Volume Licensing Center. The latest version listed over there is November 2017(en_office_online_server_last_updated_november_2017_x64_dvd_100181876.iso). In the meanwhile there have been made some patches available that are solving a lot of issues.

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New-OfficeWebAppsFarm : Office Online was unable to find the specified certificate.

When configuring a new Office Online Server i run in to the following error while setting up the new farm with command:

PS C:\Windows\system32> New-OfficeWebAppsFarm -InternalUrl "" -ExternalUrl "" -CertificateName "Skypeweb"
New-OfficeWebAppsFarm : Office Online was unable to find the specified certificate.
At line:1 char:1
+ New-OfficeWebAppsFarm -InternalUrl "" -Exter ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 + CategoryInfo : ObjectNotFound: (:) [New-OfficeWebAppsFarm], ArgumentException
 + FullyQualifiedErrorId : CertificateNotFound,Microsoft.Office.Web.Apps.Administration.NewFarmCommand

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Security Updates October 2017 Office- Web Apps and Online Server

Security Update

This security update resolves a vulnerability in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-11826.

  • KB3213659 – Microsoft Office Online Server (download)
  • KB4011231 – Microsoft Office Web Apps (download)

Supported Operating Systems

Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2