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In Skype for Business you can find all Metropolia users and you can also add your own contacts outside of Metropolia who use either Skype for Business or "home Skype" i.e. Skype for Desktop. In Microsoft Outlook calendar you can set up a Skype meeting, invite participants to it and have them join the meeting using Skype.
https://tietohallinto.metropolia.fi/pages/viewpage.action?pageId=134550803