Uninstall Microsoft Teams plus Clean Up

This worklet uninstalls Microsoft Team and cleans up as recommended by Microsoft:

Evaluation:

# Define desired registry settings
$regPath = "software\Microsoft\Office\Teams"

# Get User details including SID from Get-LocalUser
$users = Get-WmiObject -Class Win32_UserAccount -Filter "LocalAccount = 'True'"

# Add HKEY_USERS to a PSDrive for easy access later
New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS -ErrorAction SilentlyContinue | Out-Null

$nonCompliant = @()

# Loop through the list of users to check each for compliance
foreach ($user in $users) {

    # Retrieve SIDs for each user
    $sid = $user.SID
    $name = $user.Name

    # Load Registries for users, if ntuser.dat exists
    # this prevents us from attempting to load Administrator and similar accounts
    if (Test-Path "C:\Users\$name\ntuser.dat") {

        # Load user's ntuser.dat into the registry
        & reg load "HKU\$sid" "C:\Users\$name\ntuser.dat" | Out-Null

        # If this value doesn't match the desired value, add the user name to nonCompliant list
        If (Test-Path ("HKU:\$sid\$regPath")) {
            $nonCompliant += $name
        }
    }
}

# Clean-up the PSDrive
Remove-PSDrive -Name HKU

# If any users are non-compliant, "Exit 1" to flag remediation. Else "Exit 0" for Compliant
if ($nonCompliant.Count -gt 0) {
    Exit 1
} else { Exit 0}

Remediation:

# Define paths
$localPath = (Get-WmiObject -Class Win32_UserProfile -Filter "Special = $false" -ErrorAction Stop).LocalPath + "\AppData\Local"
$TeamsPath = [System.IO.Path]::Combine($localPath, 'Microsoft', 'Teams')
$TeamsUpdateExePath = [System.IO.Path]::Combine($localPath, 'Microsoft', 'Teams', 'Update.exe')

# Define uninstall command for task scheduler
$appName = 'Teams Machine-Wide Installer'
$execute = "$TeamsUpdateExePath"
$arg = "-uninstall -s"

# Current user info
$currentUsr = (Get-WmiObject -class win32_process -ComputerName 'localhost' | Where-Object name -Match explorer).getowner().user | Select-Object -First 1

# Close Teams if running
Stop-Process -Name Teams -Force

# Create, run, then delete the uninstall scheduled task
$time = (Get-Date).AddSeconds(30)
$triggerAt = New-ScheduledTaskTrigger -At $time -Once
$action = New-ScheduledTaskAction -Execute $execute -Argument $arg
Register-ScheduledTask -TaskName "Uninstall $appName" -Trigger $triggerAt -Action $action -User $currentUsr
Start-Sleep 90
Unregister-ScheduledTask -TaskName "Uninstall $appName" -Confirm:$false

$uninstalled = Test-Path "C:\Users\$currentUsr\AppData\Local\Microsoft\Teams\.dead"

# Cleanup if Teams is uninstalled
If ($uninstalled) {

    Write-Output "Cleanup process started..."

    # Delete the Team directory recursively
    Remove-Item C:\Users\$currentUsr\AppData\Local\Microsoft\Teams* -Force -Recurse

    # Script block to remove "Teams" registry entry required for the uninstall
    # Define desired registry setting
    $regPath = "software\Microsoft\Office\Teams"

    # Get User details including SID from Get-LocalUser
    $users = Get-WmiObject -Class Win32_UserAccount -Filter "LocalAccount = 'True'"

    # Add HKEY_USERS to a PSDrive for easy access later
    New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS

    foreach ($user in $users) {

        # Retrieve SIDs for each user
        $sid = $user.SID
        $name = $user.Name

        # Load Registries for users, if ntuser.dat exists
        # this prevents us from attempting to load Administrator and similar accounts
        if (Test-Path "C:\Users\$name\ntuser.dat") {
        
            # Load user's ntuser.dat into the registry
            & reg load "HKU\$sid" "C:\Users\$name\ntuser.dat"
        
            # Create Value
            Remove-Item -Path "HKU:\$sid\$regPath"
        }
    }

    Remove-PSDrive -Name HKU

}
else
{ Write-Output "Teams is still installed... No Cleanup" }