Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


In the PowerPoint File Block Settings, you block opening or saving for PowerPoint 97-2003 Presentations, Shows, Templates, and Add-in Files. When you try to share a PowerPoint presentation in Microsoft Skype for Business 2016, even when an Office Online Server is used to present the file, the presentation fails.


Skype for Business, for compatibility with legacy clients, exports PowerPoint files by using this legacy format. When the format is blocked, the export fails. This causes the sharing process to fail.


To fix this issue, make sure that the client version is higher than 16.0.130231.20000.


Enabling this fix will break compatibility with Lync Server 2010 and earlier clients. Users can still join via the Skype for Business Web App if their client is not compatible.

To enable this fix, create a policy by using one of the following options:

  1. Create the following registry key on the client computers:


    Key: Software\Policies\Microsoft\Office\16.0\Lync

    Value Type: DWORD

    Value Name: DisableGenerationOfLegacyPPTFiles
    Value Data: 0x00000001

  2. Create the following client policy entry by using the Skype for Business PowerShell:

    $x = New-CsClientPolicyEntry -Name "DisableGenerationOfLegacyPPTFiles" -Value "true"
    Set-CsClientPolicy -Identity "<ClientPolicyName>" -PolicyEntry @{Add=$x}

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!