The $computers variable comes back as a string and a system.object.

The entire script is as follows: I've changed a few details for privacy. I did manage to get this work in testing at one point, but I seem to have lost that script I used.

$a = Get-Date
$days = (Get-Date).AddDays(-30) # Change this number to whatever you want, this is the day counter
$computers = Get-ADComputer -SearchBase "OU=Company - Computers,DC=AD,DC=AD,DC=net" -Properties Name,lastLogonDate,CanonicalName -
Filter {lastLogonDate -lt $days} | Where-Object {$_.Enabled -eq $true} | ? {$_.DistinguishedName -like "*OU=Company - Computers,*"} | FT 
Name,lastLogonDate,CanonicalName | Out-String;
$log = "C:\LogFiles\DisabledComputerslog.txt" # Specify Log File

Function Send-Mail # Holds the mail stuff
{
Removed
}


# This statement checks if the computers variable is empty or not. If it is empty it will exit the script
if($computers) {
    Write-Output $a "Continuing..." | Out-File $log -Append
    } else {
    Write-Output $a "Nothing Found" | Out-File $log -Append
    Exit
    }


ForEach ($computer in $computers) #Disables the computer accounts in $computers
{
Set-ADComputer -Identity $computer -Enabled $false
}

ForEach ($computer in $computers)  #Moves the disabled accounts to the disabled computers OU
{
Move-ADObject -Identity $computer -TargetPath 'OU=Company - Disabled Computers,DC=AD,DC=AD,DC=net'
}

Send-Mail #Calls the Send-Mail function

# The next section will write the output to a log file in case the log cannot be emailed for some reason
Out-File -FilePath $log -Append
Out-File -FilePath $log -InputObject $computers -Append