If there are issues with installing the VDI plug-in on a thin client, check the following:

• Ensure that there is sufficient space in the folder that you specified in the TEMP and TMP system variables.

• Ensure that write-protect is turned off. Refer to your device manufacturer’s documentation for instructions.

When VDI plug-in pairing fails, the pairing icon in the lower right displays as a red “X” as shown:

The following are possible reasons for failures and the corrective actions you can take.

• The user entered incorrect credentials during sign-in.

  The user should sign out of Lync and sign in again with the correct credentials. The pairing dialog box will reappear and show whether pairing is successful.

• Another instance of the remote desktop client is running.

  If they are using Remote Desktop Connection in Windows, users should do the following:

  1. Start Task Manager: Press Alt+Ctrl+Delete, and then click Start Task Manager.

  2. Click the Processes tab and look for all processes named mstsc.exe in the list.

  3. Highlight each mstsc.exe process and then click End Process.

  4. Start a new remote desktop session and try connecting again.

• The necessary files did not install correctly.

  After the plug-in is installed on the local computer, the following files should be present under C:\Program Files\Microsoft Office\Office15 (or the appropriate drive letter):

  • LyncVdiPlugin.dll

  • UcVdi.dll

  If there are any issues with VDI pairing, check to make sure that these files are present on the local computer.

• The Lync client is running on the local computer.

  To use the Lync VDI plugin, a Lync client must not be running on the local computer, otherwise pairing will fail. As a best practice, the user should not install a Lync client on the local computer.