open a mailbox to which I have full access - powershell

Question

I can open my mailbox in exchange online with EWS and Powershell
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService
$service.Credentials = New-Object System.Net.NetworkCredential -ArgumentList $mail, $password
$service.URL = New-Object Uri("https://outlook.office365.com/EWS/Exchange.asmx")
$view = New-Object Microsoft.Exchange.WebServices.Data.ItemView($numOfEmailsToRead, $index)
$folderview = New-Object Microsoft.Exchange.WebServices.Data.FolderView(10)
$folderview.PropertySet = New-Object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.Webservices.Data.BasePropertySet]::FirstClassProperties)
$folderview.PropertySet.Add([Microsoft.Exchange.Webservices.Data.FolderSchema]::DisplayName)
$folderview.Traversal = [Microsoft.Exchange.Webservices.Data.FolderTraversal]::Deep
$folderfindResults = $service.FindFolders([Microsoft.Exchange.Webservices.Data.WellKnownFolderName]::Inbox, $folderview)
$SearchFilterContainsSubString = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+ContainsSubstring([Microsoft.Exchange.WebServices.Data.ItemSchema]::Subject, $Paramerter)
$SearchFilterNot = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+Not($SearchFilterContainsSubString)
foreach ($InboxFolder in $folderfindResults) {
$findResultsItems = $InboxFolder.findItems($SearchFilterNot,$view)}
How do I change the code to open a mailbox to which I have full access?

Answer 1

In your example you need to use the Mailbox overload for Folder id so change
$folderfindResults = $service.FindFolders([Microsoft.Exchange.Webservices.Data.WellKnownFolderName]::Inbox, $folderview)
$SearchFilterContainsSubString = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+ContainsSubstring([Microsoft.Exchange.WebServices.Data.ItemSchema]::Subject, $Paramerter)
$SearchFilterNot = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+Not($SearchFilterContainsSubString)
foreach ($InboxFolder in $folderfindResults) {
$findResultsItems = $InboxFolder.findItems($SearchFilterNot,$view)}
To
$MailboxToAccess = "blah#blah.com"
$folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$MailboxToAccess)
$folderfindResults = $service.FindFolders($folderid, $folderview)
$SearchFilterContainsSubString = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+ContainsSubstring([Microsoft.Exchange.WebServices.Data.ItemSchema]::Subject, $Paramerter)
$SearchFilterNot = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+Not($SearchFilterContainsSubString)
foreach ($InboxFolder in $folderfindResults) {
$findResultsItems = $InboxFolder.findItems($SearchFilterNot,$view)}

Answer 2

Here is a simple example of connecting to a different mailbox
$MailboxName = New-Object Microsoft.Exchange.WebServices.Data.Mailbox("support#domain.com") #specifies which mailbox EWS should connect to
$folderid= new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$MailboxName)
$Inbox = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)
For more detailed info please read this blog: https://gsexdev.blogspot.com/2016/10/ews-basics-accessing-and-using-shared.html

Answer 3

Thank you for your support.
I was able to do it with the line
$service.ImpersonatedUserId = New-Object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress,$Mailbox);
Resolve.
I was getting a 401 error. The error was because I had overwritten the credentials. Now everything works.
In Exchange the executing user needs the role
"ApplicationImpersonation"