How to secure workstations in cloud environment (Office 365, Dropbox, etc)

I am very familiar (15+ years) with setting up Windows-based (mostly SBS) networks for my clients. However now I would like to setup an entirely cloud-based solution for a customer who will use the following:

Office 365 for email, word processing, etc
Dropbox for file storage (they're not keen on OneDrive)
A cloud based accounting package

How can I "secure" the company workstations so only employees can log on to them? There will not be a local server with Active Directory to check usernames and passwords as has been common in the past.

I am also considering rolling out an SSO solution (e.g. Centrify), but not sure if this will extend to securing the workstation login as well.

This is my first venture into cloud solutions so I hope the experts can assist with some ideas and pointers.
dbasplusAsked:
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Martin FernandezCommented:
I would suggest to use cloud systems. For example, Google has all those applications that you need for every workstation:

You can visit this link in order to get a bigger look to Google Apps for Work.

Today is an advantage to work in the cloud:
Information loss is very less than local workstations.
Information is encrypted
Login and use logging.
etc

Even you can search for Centrify alternatives here

Good luck!
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dbasplusAuthor Commented:
Thanks but that doesn't really help me in how best to secure the logons to the workstations themselves. The client has already decided which cloud apps they want to use, so I don't need information on Google Apps or Centrify alternatives for now.

What I do need to know is how to best secure the workstations.

Can I use their Office 365 as a workstation logon?
Can I use their SSO (Centrify or other) logon as a workstation logon?
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Vasil Michev (MVP)Commented:
You will be able to use O365 login (Azure AD join) in Windows 10, which will allow you to control some security related aspects: http://blogs.technet.com/b/ad/archive/2015/05/13/azure-active-directory-and-windows-10-making-the-enterprise-cloud-a-reality.aspx

You can also impose some restrictions with GPO, but local AD is always the preferred solution.
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