diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee5321b4b..1c9d914c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## 0.9.0 (unreleased)
 
+  - `config.vm.customize` now takes a command to send to `VBoxManage`, so any
+    arbitrary command can be sent. The older style of passing a block no longer
+    works and Vagrant will give a proper error message if it notices this old-style
+    being used.
   - Logging. The entire Vagrant source has had logging sprinkled throughout
     to make debugging issues easier. To enable logging, set the VAGRANT_LOG
     environmental variable to the log level you wish to see. By default,
diff --git a/lib/vagrant/action.rb b/lib/vagrant/action.rb
index 342044335..a931f3e97 100644
--- a/lib/vagrant/action.rb
+++ b/lib/vagrant/action.rb
@@ -33,6 +33,7 @@ module Vagrant
       autoload :ClearForwardedPorts, 'vagrant/action/vm/clear_forwarded_ports'
       autoload :ClearNFSExports,     'vagrant/action/vm/clear_nfs_exports'
       autoload :ClearSharedFolders,  'vagrant/action/vm/clear_shared_folders'
+      autoload :Customize,           'vagrant/action/vm/customize'
       autoload :Destroy,             'vagrant/action/vm/destroy'
       autoload :DestroyUnusedNetworkInterfaces, 'vagrant/action/vm/destroy_unused_network_interfaces'
       autoload :DiscardState,        'vagrant/action/vm/discard_state'
diff --git a/lib/vagrant/action/builtin.rb b/lib/vagrant/action/builtin.rb
index a45274c88..1048b97a9 100644
--- a/lib/vagrant/action/builtin.rb
+++ b/lib/vagrant/action/builtin.rb
@@ -29,6 +29,7 @@ module Vagrant
           use VM::ShareFolders
           use VM::HostName
           use VM::Network
+          use VM::Customize
           use VM::Boot
         end
       end
diff --git a/lib/vagrant/action/vm/customize.rb b/lib/vagrant/action/vm/customize.rb
new file mode 100644
index 000000000..5469fb576
--- /dev/null
+++ b/lib/vagrant/action/vm/customize.rb
@@ -0,0 +1,30 @@
+module Vagrant
+  module Action
+    module VM
+      class Customize
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          customizations = env[:vm].config.vm.customizations
+          if !customizations.empty?
+            env[:ui].info I18n.t("vagrant.actions.vm.customize.running")
+
+            # Execute each customization command.
+            customizations.each do |command|
+              processed_command = command.collect do |arg|
+                arg = env[:vm].uuid if arg == :id
+                arg
+              end
+
+              env[:vm].driver.execute_command(processed_command)
+            end
+          end
+
+          @app.call(env)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/vagrant/config/vm.rb b/lib/vagrant/config/vm.rb
index 52b3f0f50..92e3cb29e 100644
--- a/lib/vagrant/config/vm.rb
+++ b/lib/vagrant/config/vm.rb
@@ -4,8 +4,6 @@ require 'vagrant/config/vm/provisioner'
 module Vagrant
   module Config
     class VMConfig < Base
-      include Util::StackedProcRunner
-
       attr_accessor :name
       attr_accessor :auto_port_range
       attr_accessor :box
@@ -17,6 +15,7 @@ module Vagrant
       attr_reader :shared_folders
       attr_reader :network_options
       attr_reader :provisioners
+      attr_reader :customizations
       attr_accessor :guest
 
       def initialize
@@ -24,6 +23,7 @@ module Vagrant
         @shared_folders = {}
         @network_options = []
         @provisioners = []
+        @customizations = []
       end
 
       def forward_port(name, guestport, hostport, options=nil)
@@ -64,8 +64,25 @@ module Vagrant
         @provisioners << Provisioner.new(name, options, &block)
       end
 
-      def customize(&block)
-        push_proc(&block)
+      # TODO: This argument should not be `nil` in the future.
+      # It is only defaulted to nil so that the deprecation error
+      # can be properly shown.
+      def customize(command=nil)
+        if block_given?
+          raise Errors::DeprecationError, :message => <<-MESSAGE
+`config.vm.customize` now takes an array of arguments to send to
+`VBoxManage` instead of having a block which gets a virtual machine
+object. Example of the new usage:
+
+    config.vm.customize ["modifyvm", :id, "--memory", "1024"]
+
+The above will run `VBoxManage modifyvm 1234 --memory 1024` where
+"1234" is the ID of your current virtual machine. Anything you could
+do before is certainly still possible with `VBoxManage` as well.
+          MESSAGE
+        end
+
+        @customizations << command if command
       end
 
       def defined_vms
diff --git a/lib/vagrant/driver/virtualbox.rb b/lib/vagrant/driver/virtualbox.rb
index 4647bf8c9..6d43bdffc 100644
--- a/lib/vagrant/driver/virtualbox.rb
+++ b/lib/vagrant/driver/virtualbox.rb
@@ -74,6 +74,11 @@ module Vagrant
         end
       end
 
+      # Executes a raw command.
+      def execute_command(command)
+        execute(*command)
+      end
+
       # Forwards a set of ports for a VM.
       #
       # This will not affect any previously set forwarded ports,
@@ -171,7 +176,7 @@ module Vagrant
       # This reads the folder where VirtualBox places it's VMs.
       def read_machine_folder
         execute("list", "systemproperties").split("\n").each do |line|
-          if line =~ /^Default machine folder:\s+(.+?)$/
+          if line =~ /^Default machine folder:\s+(.+?)$/i
             return $1.to_s
           end
         end
diff --git a/lib/vagrant/errors.rb b/lib/vagrant/errors.rb
index 274f2ce1f..0fad2ec7f 100644
--- a/lib/vagrant/errors.rb
+++ b/lib/vagrant/errors.rb
@@ -138,6 +138,11 @@ module Vagrant
       error_key(:config_validation)
     end
 
+    class DeprecationError < VagrantError
+      status_code(60)
+      error_key(:deprecation)
+    end
+
     class DotfileIsDirectory < VagrantError
       status_code(46)
       error_key(:dotfile_is_directory)
diff --git a/templates/locales/en.yml b/templates/locales/en.yml
index 20ab73928..abfce1148 100644
--- a/templates/locales/en.yml
+++ b/templates/locales/en.yml
@@ -31,6 +31,12 @@ en:
         are printed below:
 
         %{messages}
+      deprecation: |-
+        You are using a feature that has been removed in this version. Explanation:
+
+        %{message}
+
+        Note that this error message will not appear in the next version of Vagrant.
       dotfile_is_directory: |-
         The local file Vagrant uses to store data ".vagrant" already exists
         and is a directory! If you are in your home directory, then please run