A powershell script that will find all the inactive users in a directory (users who have not logged in for 90 + days) and outputs the results into a csv file.

inactiveUsers.ps1

# Function to check if Active Directory module is installed
function Check-ADModuleInstalled {
    if (Get-Module -ListAvailable -Name ActiveDirectory) {
        return $true
    } else {
        Write-Host "Active Directory module is not installed."
        return $false
    }
}

# Function to retrieve inactive users
function Get-InactiveADUsers {
    # Define the number of days for inactive users
    $daysInactive = 90

    # Get the current date
    $currentDate = Get-Date

    # Calculate the inactive threshold date
    $thresholdDate = $currentDate.AddDays(-$daysInactive)

    # Get inactive users
    $inactiveUsers = Get-ADUser -Filter {LastLogonDate -lt $thresholdDate} -Properties LastLogonDate | Where-Object { $_.Enabled -eq $true }

    return $inactiveUsers
}

# Check if Active Directory module is installed
if (Check-ADModuleInstalled) {
    # Retrieve inactive users
    $inactiveUsers = Get-InactiveADUsers

    if ($inactiveUsers) {
        # Define CSV file path
        $csvFilePath = "over90Days.csv"

        # Output inactive users to CSV
        $inactiveUsers | Select-Object SamAccountName, LastLogonDate | Export-Csv -Path $csvFilePath -NoTypeInformation

        Write-Host "Results exported to $csvFilePath"
    } else {
        Write-Host "No inactive users found."
    }
}

In this script:

• The Check-ADModuleInstalled function checks if the Active Directory module is installed. If it is, it returns true; otherwise, it returns false.
• The Get-InactiveADUsers function retrieves inactive users from Active Directory.
• The script first checks if the Active Directory module is installed using the Check-ADModuleInstalled function. If it is installed, it proceeds to retrieve inactive users using the Get-InactiveADUsers function and exports the results to a CSV file. If the module is not installed, it displays a message indicating that the module is not installed.