Skype for Business

Skype for Business (formerly Microsoft Lync) provides secure instant messaging and virtual meeting capabilities, including web/video/audio conferencing and sharing desktops and presentations. 

Skype for Business may already be installed on your computer. To find out about your departmental policy, please contact your local IT support desk.

These installation instructions are for personally owned computers (e.g. students using the WashU Office 365 account to install Office on personally owned computers). For installation on WashU owned computers, please call your help desk.

  1. NOTE: If you want to download the latest Mac Skype for Business client, click here
  2. Login to Office 365 using your WUSTL Key at
  3. Click on the small Gear icon at the top-right, Go down to the last section near the bottom labeled Your app settings and select Office 365
  4. At the bottom of Office 365 Settings page, click Software: Install Software
  5. In the Software menu on the left-hand side of the page click the third option which should be Skype for Business
  6. Click the install button below the Skype for Business (Lync if installing on a Mac) icon
    • Windows: It will be near the bottom of the Skype for Business screen
    • Mac OS: It will be Near the middle of the Lync screen, click the Install button
  7. Once the installer is downloaded, run it and follow the on-screen instructions

  1. Open the Skype for Business Application and accept the software license agreement
  2. In the Sign-in Address (or Email Address) field, enter one of the following:
    1. If your WUSTL Key ID and the first part of your email match, enter your
    2. If your WUSTL Key ID and the first part of your email DO NOT match, enter your
  3. Select Sign In
  4. Once prompted to enter a password, enter in your WUSTL Key password, and select Sign In again
  5. If prompted, select if you would like the Skype for Business client to automatically sign you in in the future

Having trouble hearing?
Quick fixes:
1. Check to make sure you don’t have the call on hold. If so, click Resume Call button at bottom of screen.

2. Check to make sure that you don’t have sound muted on your computer. Click the loudspeaker icon in the bottom right of your computer screen (not the Skype window).

3. Check to make sure that Skype for Business is playing back through the correct audio device. Click the telephone icon in the bottom right corner of your Skype meeting window (not the red one in the middle). If you do not see the telephone icon in your meeting session as shown below, skip to step 4. You can adjust volume here (independent of your computer sound volume). If your volume isn’t turned down, choose Devices. Ensure the proper audio device for playback is selected. The image below is from the web app, but the desktop version of Skype for Business is similar.

4. If you do not see the small telephone in the lower right corner of your meeting window, this means that Skype for Business does not detect an audio device. Without an audio device set-up, you will not be able to join a meeting in the Skype web app, and you will not be able to hear any sound if you use the Skype for Business desktop app. To confirm this is your issue, close your meeting window. Go to the main Skype window (in the desktop app). Look for this symbol in the bottom left corner of the main SfB window:

Click this warning icon to edit your audio device settings.

Note: SfB requires both audio input (a microphone) and output (speakers or earbuds) in order to join a meeting’s audio (yes, even if you are not planning on saying anything during the meeting). SfB does not require video input such as a webcam. However, if you do not have a mic, and do not need to speak during a meeting (for example, during SfB presentations), you can still hear the audio without a mic, as long as you have any 3.5mm jack plugged into the microphone input (for example, a pair of earbuds without a mic plugged into the mic input). You will need to leave and rejoin a meeting after changing your audio device setup (for example when plugging in headphones). See below for more details.

Most laptops have audio input (mic) and output (speakers) built-in. If your laptop has a mic built-in but you are not seeing it in the Sound section of your Control Panel, it may simply be disabled. Right-click in any empty space in the recording tab, and choose Show Disabled Devices. Right-click on the device to choose Enable. To troubleshoot your audio device setup:

Identify your audio input/output plugs. Some computers have separate plugs for headphones and microphones, and some have a combo. The combo plug has a headset icon, and there will only be one plug.

How you set up your audio device for the meeting depends upon your computer and the equipment you have. SfB does not require any particular sort of audio equipment.

  • If you have a webcam: Many webcams have a mic built-in. Plug it in (you don’t have to turn on video for your meeting). SfB should automatically detect the mic in the webcam, and sound will come through whatever default output device you have selected for your computer. Leave the meeting and rejoin after plugging in the webcam.
  • If your computer has a combo headset input, you may use any standard earbuds with mic, such as the ones you use for your phone. You do not need a specialized headset to use SfB. When you plug in your earbuds, your computer should detect this, and pop up a window asking what you plugged in. Be sure to choose the option Headset (with microphone). If you do not get this pop-up when you plug your earbuds in, unplug them and try again. Leave and rejoin the meeting.
  • If your computer has a combo headset input and no built-in mic, but you only have earbuds without a mic, you may plug your earbuds in anyway. Still choose the option Headset (with microphone) in the pop-up window.  You will be able to hear meeting audio through your earbuds, but will not be able to speak through the meeting, as you do not have a mic. Leave and rejoin the meeting.
  • If your computer has two separate plugs, one for mic and one for headphones, you may plug in any headset with two jacks (usually one is pink and one is green). You may use a cord splitter, if your headset has only one jack. The pink jack goes into the mic input. Leave and rejoin the meeting.
  • If your computer has two separate plugs, but you only have standard phone earbuds with just one jack, you will need to plug the earbuds into the mic input (not the headphone input). You will be able to speak into the earbuds as a mic, but the sound quality is extremely poor. You will still use your computer speakers for sound. Leave and rejoin the meeting.

After plugging in the earbuds, webcam, or changing your audio device settings at all, you may have to leave the current SfB meeting and then rejoin your meeting. 

For more information:
Skype Audio and Video Troubleshooting

Quick Start Guides (from Microsoft):

Visit Skype for Business FAQ’s here




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