Unable to iterate through e-mail objects using powershell in Outlook - powershell

Question

I'm writing a script, which takes Outlook folder as input and moves every unread mail to different folder. My code:
Add-Type -assembly "Microsoft.Office.Interop.Outlook"
$Outlook = New-Object -ComObject Outlook.Application
$namespace = $Outlook.GetNameSpace("MAPI")
$olFolderInbox = 6
$inbox = $namespace.GetDefaultFolder($olFolderInbox)
$myFolder = $namespace.pickfolder()
$toFolder = $inbox.Folders | where-object { $_.name -eq "UnreadMessages" }
$messages = $myFolder.Items
$messageCount = $messages.count
for ($i = $messageCount - 1; $i -ge 0; $i--)
{
if ($messages[$i].unread -eq $True)
{
$message.move($toFolder)
}
}
The problem is, that I can not iterate through "messages" objects. Error:
Unable to index into an object of type System.__ComObject.
If it's not possible, then how am I supposed to do it?
Thanks in advance.
EDIT. It's my first day using powershell :)

Answer 1

All Outlook collections are 1 based, not 0 - you need to iterate from Items.Count down to 1.
Secondly, do not just iterate through all messages in a folder, use Items.Find/FindNext. In your case, the search criteria would be "[Unread] = true".

Answer 2

Try to do a get-member on it, and see what your options are.
$Messages | Get-Member -force
If you figure out how you want to proceed, then you can use the ForEach-Object to loop through $Messages' content like this
$Messages | ForEach-Object { Script code }
Or use its abbreviation:
$Messages | % { Script code }

Answer 3

While you cannot use PowerShell's usual indexing syntax - $messages[$i] -
for accessing the elements of $messages, you can use .Items($i) on the folder object (see the docs):
Additionally, as noted in Dmitry Streblechenko's helpful answer, indices start at 1, not 0:
for ($i = $myFolder.Items.Count; $i -ge 1; $i--)
{
$message = $myFolder.Items($i)
if ($message.unread)
{
$message.move($toFolder)
}
}
For simple forward enumeration without indices you can use foreach:
foreach ($message in $myFolder.Items) {
if ($message.unread)
{
$message.move($toFolder)
}
}
($myFolder.Items | ForEach-Object { ... } should work too, but it will be slower.)
That said, Dmitry's answer answer also points to how to perform a filtered enumeration at the source, which performs much better.

Answer 4

Thanks for replying. All your answers were helpful. I finally used foreach loop. While I was trying to use $message = $myFolder.Items($i) following error appeared:
Method invocation failed because [System.__ComObject] doesn't cont
ain a method named 'Items'
so there is no possibility to iterate using indexes in this case.
Thank You all for your time :)