# Check if PowerShell 2.0 is installed
Get-WindowsOptionalFeature -Online -FeatureName MicrosoftWindowsPowerShellV2Root

# If you still need PowerShell 2.0 (NOT RECOMMENDED)
# - Use older Windows versions
# - Use Windows containers with older base images
# - Upgrade scripts to PowerShell 5.1 or 7+

# Recommended: Migrate to PowerShell 7.5+
winget install Microsoft.PowerShell

# OLD (MSOnline) - STOPS WORKING MAY 2025
Connect-MsolService
Get-MsolUser
Set-MsolUser -UserPrincipalName "user@domain.com" -UsageLocation "US"

# NEW (Microsoft.Graph 2.32.0)
Connect-MgGraph -Scopes "User.ReadWrite.All"
Get-MgUser
Update-MgUser -UserId "user@domain.com" -UsageLocation "US"

# OLD (AzureAD) - STOPS WORKING MARCH 2025
Connect-AzureAD
Get-AzureADUser
New-AzureADUser -DisplayName "John Doe" -UserPrincipalName "john@domain.com"

# NEW (Microsoft.Graph 2.32.0)
Connect-MgGraph -Scopes "User.ReadWrite.All"
Get-MgUser
New-MgUser -DisplayName "John Doe" -UserPrincipalName "john@domain.com"

Install-Module -Name Microsoft.Graph.Entra -Scope CurrentUser
Connect-Entra
Get-EntraUser

# OLD (WMIC) - REMOVED
wmic process list brief
wmic os get caption

# NEW (PowerShell CIM)
Get-CimInstance -ClassName Win32_Process | Select-Object Name, ProcessId, CommandLine
Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object Caption, Version

# For detailed process info
Get-Process | Format-Table Name, Id, CPU, WorkingSet -AutoSize

# For system info
Get-ComputerInfo | Select-Object WindowsProductName, WindowsVersion

# Install PSResourceGet (ships with PowerShell 7.4+)
Install-Module -Name Microsoft.PowerShell.PSResourceGet -Force

# New commands (PSResourceGet)
Install-PSResource -Name Az -Scope CurrentUser  # Replaces Install-Module
Find-PSResource -Name "*Azure*"                 # Replaces Find-Module
Update-PSResource -Name Az                      # Replaces Update-Module
Get-InstalledPSResource                         # Replaces Get-InstalledModule

# Compatibility layer available for legacy scripts
# Your old Install-Module commands still work but call PSResourceGet internally

# OLD (Draft 4 schema) - NO LONGER SUPPORTED
$schema = @"
{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object"
}
"@

Test-Json -Json $json -Schema $schema  # FAILS in PowerShell 7.4+

# NEW (Draft 6+ schema) - SUPPORTED
$schema = @"
{
  "$schema": "http://json-schema.org/draft-06/schema#",
  "type": "object"
}
"@

Test-Json -Json $json -Schema $schema  # WORKS

# OLD (PowerShell 5.1 and earlier)
#Requires -PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn

# NEW (Use modules instead)
#Requires -Modules ExchangeOnlineManagement

Import-Module ExchangeOnlineManagement
Connect-ExchangeOnline

# Create JEA session configuration
New-PSSessionConfigurationFile -SessionType RestrictedRemoteServer `
    -Path "C:\JEA\RestrictedAdmin.pssc" `
    -VisibleCmdlets @{
        Name = 'Restart-Service'
        Parameters = @{ Name = 'Name'; ValidateSet = 'Spooler' }
    } `
    -LanguageMode NoLanguage

# Register JEA endpoint
Register-PSSessionConfiguration -Name RestrictedAdmin `
    -Path "C:\JEA\RestrictedAdmin.pssc" `
    -Force

# Connect with limited privileges
Enter-PSSession -ComputerName Server01 -ConfigurationName RestrictedAdmin

# Create WDAC policy for PowerShell scripts
New-CIPolicy -FilePath "C:\WDAC\PowerShellPolicy.xml" `
    -ScanPath "C:\Scripts" `
    -Level FilePublisher `
    -Fallback Hash

# Convert to binary and deploy
ConvertFrom-CIPolicy -XmlFilePath "C:\WDAC\PowerShellPolicy.xml" `
    -BinaryFilePath "C:\Windows\System32\CodeIntegrity\SIPolicy.p7b"

# Check current language mode
$ExecutionContext.SessionState.LanguageMode
# Output: FullLanguage (admin) or ConstrainedLanguage (standard user)

# Set system-wide constrained language mode via Group Policy or Environment Variable
# Set HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\__PSLockdownPolicy = 4

# Check PowerShell version
$PSVersionTable.PSVersion
# 7.5.4 (stable) or 7.6.0-preview.5

# .NET version
[System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription
# .NET 9.0.101

# Test for deprecated module usage
Get-Module MSOnline, AzureAD -ListAvailable
# If found, plan migration immediately

# Test for PowerShell 2.0 dependencies
Get-Content "script.ps1" | Select-String -Pattern "powershell.exe -Version 2"
# If found, remove version parameter

# Test for WMIC usage
Get-ChildItem -Path "C:\Scripts" -Recurse -Filter "*.ps1" |
    Select-String -Pattern "wmic" |
    Select-Object Path, Line

# Verify PowerShell version compatibility
#Requires -Version 7.0
Test-Path $PSCommandPath  # Ensures script is PowerShell 7+