If you try to update the Microsoft Exchange Powershell Module an get error that your administrator has blocked this application because it potentially pose a security risk to your computer.
There is a quick fix to get pass this error:
Open regedit and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT.NETFramework\Security\TrustManager\PromptingLevel
Change Internet to Enabled:
Then you should be able to update the module.