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+<#
+.NOTES
+  Script name: Set-TagsInGuestinfo.ps1
+  Created on: 10/02/2018
+  Author: Doug Taliaferro, @virtually_doug
+  Description: Gets the vSphere Tags assigned to a VM and makes them available to the guest OS.
+  Dependencies: None known
+
+  ===Tested Against Environment====
+  vSphere Version: 6.5
+  PowerCLI Version: 10.0.0.7893909
+  PowerShell Version: 5.1.14409.1005
+  OS Version: Windows 7, 10
+  Keyword: VM, Tags, Guestinfo
+
+.SYNOPSIS
+  Gets the vSphere Tags assigned to a VM and makes them available to the guest OS.
+
+.DESCRIPTION
+  Gets the tags assigned to one or more VMs from one or more categories and sets the tag values
+  in the VM's 'guestinfo' advanced settings.  This makes the tags available within the guest OS
+  using VM tools (vmtoolsd.exe) and allows the tags to be used as metadata for applications or
+  management agents that run inside the guest.
+  
+  For example, if a VM has a tag named 'Accounting' from the
+  category 'Departments', the advanced setting becomes:
+    guestinfo.Departments = Accounting
+  
+  This can be retrieved in the guest OS by running:
+    vmtoolsd.exe --cmd "info-get guestinfo.Departments"
+
+  If multiple tags are assigned from the same category, they are joined using the specified
+  delimter (a semicolon by default):
+    guestinfo.Departments = Accounting;Sales
+
+.PARAMETER VMs
+  One or more VMs returned from the Get-VM cmdlet.
+
+.PARAMETER Categories
+  The names of tag categories that should be set in the advanced settings.
+ 
+ .PARAMETER Delimiter
+  The delimiting character used for multiple tags of the same category.  Defaults to a
+  semicolon.
+
+.PARAMETER vCenter
+  The vCenter server to connect to.  Optional if you are already connected.
+
+.EXAMPLE
+  .\Set-TagsInGuestInfo.ps1 -VM (get-vm testvm01) -Categories Departments, Environment
+  
+  Gets tags assigned to 'testvm01' in the Departments and Environment categories and
+  sets their values in 'guestinfo.Departments' and 'guestinfo.Environment'.
+
+.EXAMPLE
+  .\Set-TagsInGuestInfo.ps1 -VM (get-cluster Dev-01 | get-vm) -Categories Departments
+  
+  Gets tags assigned to all VMs in the Dev-01 cluster and sets 'guestinfo.Departments'
+  on each VM.
+#>
+#Requires -modules VMware.VimAutomation.Core
+[CmdletBinding()]
+param (
+  [Parameter(Mandatory=$true,Position=0)]
+  $VMs,
+  [Parameter(Mandatory=$true,Position=1)]
+  [string[]]$Categories,
+  [string]$Delimiter = ';',
+  [string]$vCenter
+)
+if ($vCenter) {
+  Connect-VIServer $vCenter
+}
+
+ForEach ($categoryName in $Categories) {
+  $category = Get-TagCategory -Name  $categoryName
+  if ($category) {
+    $guestinfoName = "guestinfo.$category"
+
+    # Get Tag assignments for the VMs
+    $tags = Get-TagAssignment -Entity $VMs -Category $category
+	
+	# Group the tags by VM (in this case the Entity property of Group-Object)
+    $groups = $tags | Group-Object -Property Entity
+	
+	# Get each VM and set the guestinfo
+    ForEach ($item in $groups) {
+      $vm = get-vm $item.Name
+	  # Multiple tags of the same category are joined
+      $guestinfoValue = $item.Group.Tag.Name -join $Delimiter
+	  
+      Write-Host "$($vm): setting '$guestinfoName' = '$guestinfoValue'"
+      New-AdvancedSetting -Entity $vm -Name $guestinfoName -Value $guestinfoValue -Confirm:$false -Force | Out-Null
+    }
+  } else {
+      Write-Host "Category '$categoryName' was not found."
+  }
+}