How To: Upgrade Office Web Apps 2013 to Office Online Server 2016
On your current farm run “Get-OfficeWebAppsFarm”. Make a note of the InternalURL, ExternalURL, CertificateName and Machines (Note you may only have the ExternalURL configured). E.g. InternalURL: https://webapps.mycompany.local ExternalURL: https://webapps.mycompany.com CertificateName: My WAC Certificate Machines: WebApps01, WebApps02 Run “Get-OfficeWebAppsHost”. Make a note of the allowList. E.g. allowList: mycompany.com, mycompany.local On each Office Web Apps 2013 server: Uninstall “Microsoft Office Web Apps Server 2013” Install Windows Identity Foundation 3.5 (Add Roles and Features > Features) Install the Update for Universal C Runtime in Windows KB (https://support.microsoft.com/en-gb/kb/2999226) Install Microsoft Office Online Server 2016 Using the information you gathered from Get-OfficeWebAppsFarm, on the first machine in the farm (WebApps01) run New-OfficeWebAppsFarm, E.g. New-OfficeWebAppsFarm -InternalURL https://webapps.mycompany.local -ExternalURL https://webapps.mycompany.com -CertificateName “My WAC Certificate” ...