Registry Subkey Count In Powershell

What is the correct syntax for getting a registry subkey count in Powershell, and if that count passes the If statement, then continue.
I am testing this to see if an Outlook profile has not been setup on this computer than continue, otherwise end script

Here is what I have so far:

Get-ChildItem "hkcu:\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles"
[string]$regKeys = Get-ChildItem "hkcu:\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles"

If ($regKeys._GetSubKeyCount -lt 5)
            'Outlook is setup on this computer'
            'Outlook is not setup on this Computer'

I don't believe that I have the ._GetSubKeyCount syntax correct. Please advise.
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Try this sample:
[string]$regKey = "hkcu:\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles"
$(Get-Item $regKey).subkeycount

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Strange way to do things. It's been a couple of years since I managed exchange server but outlook should do all of this for you. I guess your probably not on exchange. Anyways maybe this might be a better way of doing things
$user = [Environment]::UserName

$foo = Get-ChildItem "HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles" -recurse -ErrorAction SilentlyContinue `
| ForEach-Object {get-itemproperty -Path $_.PsPath} `
| where {$_."001e6603" -match "$user"}

if ($foo -ne $null) {Write-Host "Outlook profile seems to exist for user $user, abort"} else {Write-Host "No Outlook profile found for $user starting process..."}

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