What is needed in order to use Skype For Business?

What is needed in order to use Skype For Business?
Basically, we'd like to use Skype For Business to share screens and chat between two persons in our company but our company is NOT using Office 365.
So we downloaded and installed Skype For Business. On the Sign In page, we see the message "Use the sign-in address for your organization - not a Skype Name or Microsoft account".
Please see attached screen shot.

What is the "sign-in address for your origanization"? How can we get it? Does this mean that we have to open an O365 account and be a subscriber?

Thanks
Skype-For-Business.png
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Y YconsultantAsked:
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timgreen7077Exchange EngineerCommented:
Either you will need to setup skype for business in your on-prem environment using local servers and MS licenses, or you will need to use O365 and obtain the appropriate license for it.
Vasil Michev (MVP)Commented:
Yes, you need Office 365 (Skype for Business Online) account, the application is useless without it. If it's only chat and screen sharing between two people, you can use any number of alternatives, including the consumer Skype (which is different from Skype for Business).

Or you can sing up for a free Office 365 trial and test it.
Y YconsultantAuthor Commented:
Is consumer Skype able to share screen? If so, how can i make it as i can never make it in the past, and this made me think consumer Skype could not do it.
Karl Timmermans (Outlook MVP)PrincipalCommented:
Is consumer Skype able to share screen?

You might want to take a look at

Screen sharing
https://www.skype.com/en/features/screen-sharing/

*** note that the option to screen share requires that the person who you want to share your screen with must first answer the call

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Y YconsultantAuthor Commented:
Thank you mates!
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