Skype users worldwide can invite anyone to join a Skype chat by sharing a unique Skype Meeting link via the Skype for Business Web App. No Skype account or app download is required for this purpose.

4. On the next page, you have the option to add the meeting to your Google Calendar, Outlook Calendar, or Yahoo Calendar. Or, you can copy the invitation link and share it with your guests.

Microsoft Outlook makes it super easy to schedule meetings with colleagues. When a user sends an invite, and the recipient receives an invitation email with the meeting details, he can join it.