Scenario: You received what appears to be a typical Lync online meeting invitation in your Outlook Inbox. Clicking on the “Join Lync meeting” or copy and paste the URL link directly into a supported browser kicks starts your locally installed copy of full Lync 2010 client with latest CU6 patch (4.0.7577.4103). The latter launches and you successfully join the meeting.
Instance Message, VoIP audio and video appear to work as expected. Nevertheless, when the presenter starts to share something, say a PowerPoint presentation, you are greeted with a very strange error message:
The presenter is sharing content that requires Microsoft Lync 2010. Click Join to use the new version so that you see all of the content. [ Join ]
You double-checked and ascertained that everything is in order. So what could be wrong?
It turns out that if a Lync online meeting presenter’s account is located on a Lync Server 2013 front-end server home pool, and that s/he is running the Lync 2013 client to present the Lync online meeting, participants joining using the current Lync 2010 release of client software will encounter the said error message. This can happen whether the presenter and Lync online meeting participants are from the same company / AD domain, or simply joining as external guests from other organizations (or Active Directory forests / domains).
To resolve this, just append ?sl= (*) to the meeting URL to force the use of the (new) Lync Web App piece, where the full communications and collaborative modality, including 2-way audio and video, will be available. Prior to that, you must download and accept the installation prompt “Install Lync Web App Plug-in for meeting, audio, video and screen sharing”. This is a small .MSI package that executes without the need for local administrative rights or permissions on your Windows desktop machine.
In addition, you may be prompted with a one-time “Windows Security Alert” to permit Lync Web App Plug-in to communicate across configured networks on your machine through Windows Firewall (domain, private or public networks).
(*) search for “Lync 2010, Silverlight and Lync Web App” for more info
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