Send an instant message
Use instant messaging (IM) to touch base with your contacts right away.
1.In your Contacts list, point to the contact you want to IM or type in their email address.
2.Click the IM button. If you want to IM with more than one contact, hold down the Ctrl key and click each contact name, then right click on any of the names and select "Send an IM".
3.Type your message and press the Enter key on your keyboard.
Need to bring someone else into the IM?
From the main Skype for Business window, drag a contact pic onto the IM window or you can click on the "person plus" icon instead.
Cant see your Skype window? It could be hiding - try moving your other windows around or go to the taskbar at the bottom of your screen
and click on the Skype for Business icon to see which windows are already open.
Switch between conversations
If you have several conversations or meetings going on at the same time, Skype for Business displays them all in one place, so you can toggle between them.
Add audio, video and share files in an IM conversation
At the bottom of your IM window you will see the icons below. Click on the relevant one to add that facility to your call.
Please note that when you select to "Add audio" you should select the "Skype call" option and use a headset or speakers with a microphone.