A Microsoft Account (Windows Live ID) is required to sign up for the Skype for Business Preview Program. If you need to create a new Microsoft Account, or link a login to your current business account, you can do that here.
Microsoft Employees should use their corporate credentials for sign in.
On the next page, please select the appropriate option of the two highlighted in the image below.

Products |
Documentation & Training : |
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Org AA |
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Call Queues |
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CCE |
Cloud Connector Deep Dive: https://aka.ms/sa-cce
What's new in Cloud Connector 1.4.1: https://aka.ms/sa-cce-wn |
GA :
Products |
Documentation & Training : |
Mac |
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Clients Deep Dive |
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MMS |
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Azure Voicemail with Exchange on premises |
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Skype Room Systems v2 |