Questions about MS15-011 and how to do this

Been reading about this specific update to Group Policy operations and it has got me a little worried.
I have several Active Directory servers running Win 2008 R2 and a lot of Windows 7 client machines.  Also have Exchange servers.  
First pre-question:  is it absolutely mandatory?
1) Does this update have to be applied ONLY to the Active Directory servers?  Or does EVERY machine on the domain need this?  Including Exchange or is that not necessary?
2) If it is only applicable to the Active Directory servers, in what specific order should I do this?  Can I apply this update to one server at a time or should I do them all at once?
3) If I have to do this to the entire domain in what specific order should this be done?
4) I am unclear on what I should do after applying this update.  Do I need to do something in GPO to enable this?
5) What happens if after applying this update it breaks everything?  Breaks GPO processing, NETLOGON or SYSVOL access, etc.  What then?  

The first priority group is mobile domain clients (e.g. notebooks). But eventually, this update should be installed on all domain-joined systems, because MiTM is possible via wired connections as well. A quote from bulletin:
The vulnerability could allow remote code execution if an attacker convinces a user with a domain-configured system to connect to an attacker-controlled network.
this means that all domain-joined systems are affected.
Vadims Podāns, aka PowerShell CryptoGuy
My weblog: en-us.sysadmins.lv
PowerShell PKI Module: pspki.codeplex.com
PowerShell Cmdlet Help Editor pscmdlethelpeditor.codeplex.com
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PowerShell File Checksum Integrity Verifier tool.

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