"An error occurred" error when a Lync 2013 user joins a Lync Online meeting that is created by a non-federated user

Symptoms

Consider the following scenario:

• Microsoft Office 365 users (user A and user B) both have Microsoft Lync 2013 installed on their computers.

• User A is in an organization that is not federated with user B's organization.

• Neither user can enable an open federation.

• User A creates a Lync Online meeting.

• User B receives the meeting request from user A, and then user B clicks the Join Lync Meeting hyperlink in Outlook.

In this scenario, user B is not able to join the meeting. Additionally, user B receives the following error message:

Resolution

To resolve this issue, install the following updates:

• 2850074 Update 2850074 for Lync 2013: June 2014

• 2881013 MS14-036: Description of the security update for Microsoft Lync 2013: June 10, 2014