I am trying to use Sky, the Skype for Business client for Linux, as recommended on the Skype forums (where Office 365 was specifically mentioned as a use case). I am using it on Fedora 23. However, it is asking for both an email address and a username, which it hints should be of the form domain\user. I ignored that advice because I don't know what domain I should use, and tried just the username part of my email address, and my full email address. Neither of them worked. What should I put as the username?

  • 1
    For everyone who is about to flag this as not good for UNIX.SE, I do think this fits within the scope of the site. ("Using or administering a *nix desktop or server".)
    – William
    Jun 20, 2016 at 15:57
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    Do you have an Office 365 account? AFAIK they're associated with a business, and the domain is your business's name. If you have an email address like Robin.Green@acme.com, where your Office 365 account is provided by ACME, then typing your email address where you're asked for domain\user should work. Jun 20, 2016 at 22:43
  • Yes, I do have a business account, and no that didn't work. Jun 21, 2016 at 5:04
  • @Gilles That's exactly the answer I was looking for. Thanks! Dec 5, 2018 at 23:52

3 Answers 3


To who googled here:

Finally I sorted it out, I mean using skype for business on ubuntu.

Actually it's a Chrome plugin named ARC Welder, it's a kinda Android emulator in Chrome.

Download here: https://chrome.google.com/webstore/detail/arc-welder/emfinbmielocnlhgmfkkmkngdoccbadn?utm_source=chrome-app-launcher-info-dialog

After installed it, run it, then just drag the apk of skype for business into it's window, and enjoy!


I emailed the company that made Sky, and they said there is a known bug with sign-in for Office 365 users, and they will fix it eventually.

  • Does anyone know if the bug was fixed? Dec 12, 2017 at 0:10

Try using:

Internal server name: sipdir.online.lync.com:443

External server name: sipdir.online.lync.com:443

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