Skype for HoloLens is a mixed reality version of the popular application.
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Pro Pinning conversations everywhere works well
You can 'pin' video conversations anywhere you'd like and adjust their display sizes. For example - you can place a conversation on a wall while doing something else. The standard viewing mode puts the Skype conversation right in front of you.
Pro Non-HoloLens users are able to interact with holograms as well
When receiving a call from a HoloLens user on a Windows 10 device, non-HoloLens users will also be able to interact with the mixed reality holographic world. Skype will ask for a special HoloLens Add-in to be installed, which allows non-HoloLens users to view the holographic world of the contact and draw doodles manually.
Pro Fully integrated with Cortana
Skype uses Cortana's voice commands to control different aspects of a Skype conversation (the ability to pin a video feed to a wall, for example). You can also quickly launch Skype and call a contact by activating Cortana and by using the 'Call' command. Similarly, Cortana will notify the user of an incoming Skype call.
Pro Allows multitasking
Skype can also be run in audio-only mode on HoloLens, which allows the HoloLens user to run other holographic applications while having a conversation.
Pro Allows drawing with holograms
The HoloLens version of Skype allows users to draw holograms in your environment, or the environment of the person you're having a conversation with. This can be particularly useful when trying to explain something technical over Skype - such as the process of installing a light bulb.