Download attachments with multiple subjects from Exchange - powershell

Question

I am attempting to download attachments from emails with certain subject lines in an inbox, then delete the email.
There are about a dozen different subject lines in total.
I want to schedule this process to run every 10 minutes or so, so I'd like to keep any processing overheads to a minimum..
Current script is in PowerShell (based on this), but I'm unsure how I could make it loop through a bunch of different subjects. I could just repeat the whole script for each subject, but it's quite inefficient this way..
I'm open to non-PowerShell alternatives too..
$MailboxName = "mailbox#address.com"
$Subject = #("Subject1")
$downloadDirectory = "c:\temp"
Function FindTargetFolder($FolderPath){
$tfTargetidRoot = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::MsgFolderRoot,$MailboxName)
$tfTargetFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$tfTargetidRoot)
for ($lint = 1; $lint -lt $pfArray.Length; $lint++) {
$pfArray[$lint]
$fvFolderView = new-object Microsoft.Exchange.WebServices.Data.FolderView(1)
$SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+isEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::DisplayName,$pfArray[$lint])
$findFolderResults = $service.FindFolders($tfTargetFolder.Id,$SfSearchFilter,$fvFolderView)
if ($findFolderResults.TotalCount -gt 0){
foreach($folder in $findFolderResults.Folders){
$tfTargetFolder = $folder
}
}
else{
"Error Folder Not Found"
$tfTargetFolder = $null
break
}
}
$Global:findFolder = $tfTargetFolder
}
$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\1.2\Microsoft.Exchange.WebServices.dll"
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2007_SP1)
$windowsIdentity = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$sidbind = "LDAP://<SID=" + $windowsIdentity.user.Value.ToString() + ">"
$aceuser = [ADSI]$sidbind
$uri=[system.URI] "https://webmail.company.com.au/EWS/Exchange.asmx"
$service.Url = $uri
FindTargetFolder($ProcessedFolderPath)
$folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$MailboxName)
$InboxFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)
$Sfsub = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.ItemSchema]::Subject, $Subject[0])
$Sfha = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.EmailMessageSchema]::HasAttachments, $true)
$sfCollection = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+SearchFilterCollection([Microsoft.Exchange.WebServices.Data.LogicalOperator]::And);
$sfCollection.add($Sfsub)
$sfCollection.add($Sfha)
$view = new-object Microsoft.Exchange.WebServices.Data.ItemView(2000)
$frFolderResult = $InboxFolder.FindItems($sfCollection,$view)
foreach ($miMailItems in $frFolderResult.Items){
$miMailItems.Subject
$miMailItems.Load()
foreach($attach in $miMailItems.Attachments){
$attach.Load()
$fiFile = new-object System.IO.FileStream(($downloadDirectory + “\” + (Get-Date -Format "yyMMdd") + "_" + $attach.Name.ToString()), [System.IO.FileMode]::Create)
$fiFile.Write($attach.Content, 0, $attach.Content.Length)
$fiFile.Close()
write-host "Downloaded Attachment : " + (($downloadDirectory + “\” + (Get-Date -Format "yyMMdd") + "_" + $attach.Name.ToString()))
}
$miMailItems.isread = $true
$miMailItems.Update([Microsoft.Exchange.WebServices.Data.ConflictResolutionMode]::AlwaysOverwrite)
$miMailItems.delete([Microsoft.Exchange.WebServices.Data.DeleteMode]::MoveToDeletedItems)
}

Answer 1

Okay, here's what I've got:
$Subjects = #(
'newIM_IPSC',
'newCM_IPSC',
'CNSDI',
'SMEC_Incident_SLM',
'Incident_SLM',
'MEC_Incident_WorkInfo',
'SMEC_Incident_Header',
'SMEC_SR_Header'
)
[regex]$SubjectRegex = ‘^(?i)(‘ + (($Subjects |foreach {[regex]::escape($_)}) –join “|”) + ‘)$’
Then:
foreach($attach in $miMailItems.Attachments){
foreach ($miMailItems in $frFolderResult.Items){
if ($miMailItems.Subject -match $SubjectRegex)
{
$miMailItems.Load()
foreach($attach in $miMailItems.Attachments){
$attach.Load()
$fiFile = new-object System.IO.FileStream(($downloadDirectory + “\” + (Get-Date -Format "yyMMdd") + "_" + $attach.Name.ToString()), [System.IO.FileMode]::Create)
$fiFile.Write($attach.Content, 0, $attach.Content.Length)
$fiFile.Close()
write-host "Downloaded Attachment : " + (($downloadDirectory + “\” + (Get-Date -Format "yyMMdd") + "_" + $attach.Name.ToString()))
}
$miMailItems.isread = $true
$miMailItems.Update([Microsoft.Exchange.WebServices.Data.ConflictResolutionMode]::AlwaysOverwrite)
$miMailItems.delete([Microsoft.Exchange.WebServices.Data.DeleteMode]::MoveToDeletedItems)
}
}
Add or remove subject lines from the $Subjects array as needed.
An explanation of the bits that are building the regex can be found here:
http://blogs.technet.com/b/heyscriptingguy/archive/2011/02/18/speed-up-array-comparisons-in-powershell-with-a-runtime-regex.aspx