Wednesday , August 12 2020

Install and Configure Office Web Apps Server (OWAS) with Exchange 2013

Install and Configure Office Web Apps Server (OWAS) with Exchange 2013

and in my setup OWAS runs in Windows Server 2012 R2.

Main purpose of Office Web Apps Server with exchange 2013 is to open Email Attachment in the web browser itself. (OWAS also integrates with Sharepoint / Lync as well )

Step 1 :

Getting the Setup Files

Download the OWAS setup

Step 2 :

Installing Windows features

Install the Windows features using the below command on the server which is planned to run Office Web Apps Server (OWAS)

Add-WindowsFeature Web-Server,Web-Mgmt-Tools,Web-Mgmt-Console,Web-WebServer,Web-Common-Http,Web-Default-Doc,Web-Static-Content,Web-Performance,Web-Stat-Compression,Web-Dyn-Compression,Web-Security,Web-Filtering,Web-Windows-Auth,Web-App-Dev,Web-Net-Ext45,Web-Asp-Net45,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Includes,InkandHandwritingServices,NET-Framework-Features,NET-Framework-Core

Step 3 :

Installing Office Web Apps Server (OWAS)


Step 4 :

Checking how default Document Viewing looks

First we will open a Word Doc  and PPT normally

Old feature called as WebReady Document Viewing



Step 5 :

Exporting the Cert with Private key.

Login to Exchange 2013 – Servers – Certificates – Choose the Certificate – Export Certificate.

Am using the Same UC cert which has the entry


Exporting the Cert with the private key.


Step 6 :

Importing the Cert with Private key.

Now Open MMC in OWAS server

File – Add/Remove Snap-in


Choose Certificates – Add – Choose Computer account – click ok


Now Import the Cert To Trusted Container


Choose the PFX file which you exported earlier with the private key


Enter the password



Now you can see the Cert in the Trusted container.

2 Things

1 . Copy the Cert you imported – Paste in Personal and intermediate container.

2 . Note down the friendly name of the Cert which is the right side last column.


Now Cert has been placed properly.


Step 7 :

Configuring OfficeWebAppsFarm

Am placing Internal and External url as same . Cause my Cert doesn’t have the Internal Name in the SAN entry.

New-OfficeWebAppsFarm –InternalUrl -ExternalUrl “” -CertificateName “e2k13” -EditingEnabled

Note —

*When to use –EditingEnabled  ?

–EditingEnabled is optional and enables editing in Office Web Apps when used with SharePoint 2013. This parameter isn’t used by Lync Server 2013 or Exchange Server 2013 because those hosts don’t support editing.

* will have a public IP and points to OWAS server. If this feature has to work externally.


Now browse  – Make sure there is no Cert Errors


Step 7 :

Integrating Exchange Server 2013 with Office Web Apps Server (OWAS)

Now Login to Exchange 2013

Configuring Office Web Apps Server URL –

Set-OrganizationConfig -WACDiscoveryEndPoint


Enabling Office Web Apps Rendering –

Set-OwaVirtualDirectory “Exch2013\owa (Default Web Site)” -ForceWacViewingFirstOnPublicComputers $true -ForceWacViewingFirstOnPrivateComputers $true


Do an IIS reset if required.

Now Open the Attachment in OWA . It has much features.



About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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  1. Hi – Excellent document. I want OWAS to work externally. How do, I go about.

    I have my domain with GoDaddy where, I have necessary entry for mail server. Do, I have to add any entry at GoDaddy to make OWAS work externally. Please note GoDaddy has my Public IP that, I used for adding necessary entry for mail server to work properly + I have SAN certificate for exchange server that include, and

    This is my home lab that, I am using it for learning and gaining real world experience as close as possible. Appreciate, if you can help me on how to make OWAS work externally.

    This is my home lab setup:
    1 Domain Controller – On Server 2012 R2 – This also is running internal Certificate Authority
    2 Exchange Server 2013 (DAG setup) – Configured with SAN Certificate
    1 OWA – On Server 2012 R2 (Office Web App Server)
    1 Skype for Business 2015 – On Server 2012 R2


    • Satheshwaran Manoharan

      add a entry called in the same cert and reissue it . as assign on them.
      use this cert for owas. things should wrk

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