What is the latest Skype for Business User-Agent string?

When using a client other than Skype for Business (formerly known as Lync) to connect with your Office 365 account, you’ll need to provide the Microsoft Lync servers with a user-agent string they recognize as an “acceptable” client. The reasoning behind this is surely to give you the best possible experience and not at all to lock out other messaging clients.

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VirtualBox – Microsoft Lync has stopped working

After upgrading to Windows 10 on a virtual machine running inside VirtualBox 5.0, it became evident that Skype for Business was not gonna to start up as normal without a fight. Searching through the Windows event log, the most obvious suspect for this failure turned out to be VirtualBox itself:

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