To sign in to Microsoft Skype for Business, you must be connected to the Internet. When you’re connected, follow the steps in this topic to start Skype for Business and sign in. The first time you sign in, Skype for Business might ask for your sign-in address or password. From then on, signing in will be as easy as starting Skype for Business. You can even set Skype for Business to start automatically.
Important: If you have a subscription to the Microsoft 365 Apps for business plan or Microsoft 365 Business Standard plan and upgrade Office 2013 to Office 2016, you may find that the Skype for Business client is removed, or you may receive an error message about newer versions of Office already installed. To work around this issue, install Skype for Business (standalone) or Skype for Business (64-bit).
Start Skype for Business and sign in
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Make sure you have a connection to the Internet.
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Click Start, click All Programs, click Microsoft Office 2013, and then click Skype for Business or Lync Basic 2013.
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Under Sign-in address, type your Microsoft 365 user name, if it’s not there already.
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(Optional) Under Sign in as, click the drop-down menu, and select a status. This is how you will appear to others as soon as you sign in. If you don’t select something here, Skype for Business will set your status automatically based on your current activity or Microsoft Outlook Calendar, if you use Outlook.
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Click Sign In.
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If the Password box appears, type your Microsoft 365 password, and then click Sign In again.
Tip: To have Skype for Business start automatically when you turn on your computer, click the Options icon 
Troubleshoot sign-in issues
If you have trouble signing in, try the following troubleshooting steps before contacting your workplace technical support:
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Make sure you have a working connection, either wireless or wired. You’ll know you have a connection if you can connect to the Internet.
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Make sure your user name appears correctly in Skype for Business. If it doesn’t, click Options > Personal, and, under My account, in the Sign-in address box, retype your user name.
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In Options > Personal, click Advanced, and make sure that Automatic configuration is selected.
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Make sure you’ve typed your password correctly.
If you’ve followed these steps and still can’t resolve your sign-in issues, or if you don’t know your user name or password, contact your workplace technical support.
