Installs the latest copy of Microsoft Teams.

Install-MicrosoftTeams.ps1

<#
    .Synopsis Downloads and installs the latest version of Microsoft Teams.
    .NOTES
      TODO: Prevent Teams Firewall Popup
      https://thoor.tech/2018/11/microsoft-teams-firewall-prompt/
#>

$LogPath = "$env:WINDIR\Temp\Install-Teams.ps1.log"
Start-Transcript -Path $LogPath
$ec = 1

$TeamsInstall = Get-Package 'Teams Machine-Wide Installer' -ErrorAction SilentlyContinue
$TeamsInstall | Format-Table
if ($TeamsInstall) {
  Write-Host "Skipping installation as Teams version $($TeamsInstall.Version) was already installed."
  $ec = 0
}
else {

  Write-Host 'Create work directory.'
  $folder = "$env:temp\Teams"
  New-Item -Path $folder -ItemType Directory -ErrorAction SilentlyContinue
  Push-Location $folder

  Write-Host 'Download the installer.'
  Invoke-WebRequest -Uri 'https://teams.microsoft.com/downloads/desktopurl?env=production&plat=windows&download=true&managedInstaller=true&arch=x64' -OutFile 'Teams_windows_x64.msi'

  Write-Host 'Install'
  msiexec.exe '/i' 'Teams_windows_x64.msi' '/qn' 'OPTIONS="noAutoStart=true"' | Out-String
  $ec = $LASTEXITCODE
  Write-Host "Teams install Exit Code: $ec"


  Write-Host 'Cleanup.'
  Pop-Location
  Remove-Item $folder -Recurse

  Write-Host 'Complete.'
}

Stop-Transcript
exit $ec