[PS] Hash Map

Exploring Hashmaps in Powershell

$keep = @{} //declare an empty hashmap
/* Next add all the shared mailboxes to the hashmap */
$keep = get-mailbox | ? { $_.recipienttypedetails -eq 'sharedmailbox' } | % { $keep.add($_.name,$_.primarysmtpaddress) }
/* Big assumption for this next portion:
I'll assume you've put the list of items you want to clean up
in a csv with at least a DisplayName and EmailAddress (assuming PrimarySMTP) column
*/
$cleanup = import-csv /path/to/csv/file.csv
$cleanup | % { if (-not $keep.containskey($_.displayname)) { remove-mailbox -identity $_.displayname } }

$keep = @{} //declare an empty hashmap

/* Next add all the shared mailboxes to the hashmap */

$keep = get-mailbox | ? { $_.recipienttypedetails -eq 'sharedmailbox' } | % { $keep.add($_.name,$_.primarysmtpaddress) }

/* Big assumption for this next portion:

I'll assume you've put the list of items you want to clean up

in a csv with at least a DisplayName and EmailAddress (assuming PrimarySMTP) column

$cleanup = import-csv /path/to/csv/file.csv

$cleanup | % { if (-not $keep.containskey($_.displayname)) { remove-mailbox -identity $_.displayname } }

$myList = New-Object Collections.Generic.List[string]
$myList.Add("one")
$myList.Add("two")
$myList.Add("three")

$myHash = @{ }
$myHash.Add("list", $myList)