...
Microsoft make Skype and Skype for business software, both of which are widely used by millions of people worldwide. You need to create a free Microsoft account to use the service. At this time Microsoft do not make any hardware.
Adobe
Adobe provide a ' web-conferencing ' platform called Adobe Connect. This can be useful for providing webinars, but is not in frequent use in the Clinical School. The UIS run it as a service - more information here
...