Microsoft small business knowledge base

Article ID: 2809302 - Last Review: January 26, 2013 - Revision: 1.0


This issue will occur under the following circumstances:
  • The meeting presenter is adding a Microsoft PowerPoint presentation to a meeting that is hosted by Lync Server
  • The Lync client will stop loading the Microsoft PowerPoint presentation and provide the following error in a Lync error dialog:

    <filename.pptx> can't be uploaded because it exceeds your allowable file size


The Lync Server Web Conferencing service will convert the <filename.pptx> file into several files of the BIN file type. The conversion to the BIN file type expands the size of the Microsoft PowerPoint presentation. If this expansion process exceeds the maximum value that is set for the Lync Server content storage for conferences then the upload process will fail.

Note The BIN files will be copied by the Lync Server Web Conferencing Service to the 1-WebServices-1\CollabContent folder of the Lync Server Filestore share.


The Lync Server Set-CsConferencingConfiguration PowerShell cmdlet can be used to correct issue.

Use the steps listed below to set the Lync Server content storage maximum to a higher value:

Using Server 2008 or Server 2008 R2

  1. Click on Start, All Programs, Microsoft Lync Server 2010 or Microsoft Lync Server 2013
  2. Choose Lync Server Management Shell
Using Server 2012

  1. Press the Windows logo key to access the Start Page
  2. Click on the Lync Server Management Shell tile
Enter a Lync Server PowerShell command that is similar to the example listed below:

Set-CsConferencingConfiguration -Identity site:Redmond -MaxContentStorageMb 150

Note The Lync Server Web Conferencing service conversion of a <filename.pptx> file into several BIN files can use up to 4 times the disk space of the <filename.pptx> file

More information

For more details on using the Set-CsConferencingConfiguration PowerShell Command:

Set-CsConferencingConfiguration (

For more details on Lync Server 2010 Web Conferencing:

Features and Functionality of Web Conferencing and A/V Conferencing (
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use ( for other considerations.

Applies to
  • Microsoft Lync Server 2013
  • Microsoft Lync Server 2010 Enterprise Edition
  • Microsoft Lync Server 2010 Standard Edition
kbsurveynew KB2809302
Additional support options
Ask The Microsoft Small Business Support Community
Contact Microsoft Small Business Support
Find Microsoft Small Business Support Certified Partner
Find a Microsoft Store For In-Person Small Business Support