I need to pull all forwarding rules for an exchange online environment, and output them to a csv. this sounds simple, but I have an additional caveat. there are 23,000 mailboxes in the org.
I was able to write the script I needed, it outputted the data, but it timed out. then I was able to break out only certain mailboxes that were critical (11,000) but I was still timing out in powershell.
so finally, I found an article that detailed breaking up a script into blocks of 1,000, and running numerous sessions. and runs! it runs without timing out. but it doesn't output to the csv anymore. since my script has gone through several iterations, I'm pretty sure that my problem is the way I'm storing, or outputting the array, but for all my staring at this, I cant figure it out. short of asking the doc for a prescription of Adderall, I figured id ask here. below is the offending script.
the aliaslist.csv that it mentions is just a csv with a list of aliases for 11,000 mailboxes. if you would like to run your own tests, you can adjust $pagesize down and paste a few mailboxes into a csv called aliaslist, stored in c:\temp
Function New-O365ExchangeSession()
{
param(
[parameter(mandatory=$true)]
$365master)
#close any old remote session
Get-PSSession | Remove-PSSession -Confirm:$false
#start a new office 365 remote session
$365session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://outlook.office365.com/powershell-liveid/" -Credential $365master -Authentication Basic -AllowRedirection
$office365 = Import-PSSession $365session
}
#set input variables
$path = "C:\temp"
$InputFile = aliaslist.csv"
$UserEmail = "[email protected]"
#set variables for csv usage
$Offset = 0;
$PageSize = 1000;
$MbxMax = (Import-Csv "$path/$InputFile").count
#Loop in the list and retrieve the device’s information
$file = “c:\temp\office365-$((get-date).tostring(“yyyy-MM-dd”)).csv”
$365master = get-credential $UserEmail
New-O365ExchangeSession $365master
# call the office365 remote connection function
do{
$mbxlist=@(import-csv "$path/$InputFile"|select-object -skip $Offset -First $PageSize)
"Process entry $($Offset) to $($Offset+$PageSize)"
#end csv input count reference
ForEach($mbx in $MbxList)
{
#Write to Host
"start Processing $($mbx.alias)"
#end Write to host,
#Check rules
$rules = Get-InboxRule -mailbox $_.alias | ? {$_.RedirectTo -ne $null -or $_.ForwardTo -ne $null -or $_.ForwardAsAttachmentTo -ne $null}
If ($rules -ne $null)
{
$rules | % {
#check for forwardAsAttachments
If ($_.ForwardAsAttachmentTo -ne $null)
{
$obj = New-Object system.object
$obj | Add-Member -name "NetID" -Value $_.alias -MemberType NoteProperty
$obj | Add-Member -name "ForwardType" -Value "Forward As Attachment Rule" -MemberType NoteProperty
$obj | Add-Member -name "ForwardAddress" -Value $_.forwardAsAttachmentTo -MemberType NoteProperty
$obj | Add-Member -name "Enabled" -Value $_.Enabled -MemberType NoteProperty
$obj | Add-Member -name "Description" -Value $f -MemberType NoteProperty
If (Test-Path $file)
{
$mbx.alias + ”,” + ($obj | ConvertTo-Csv)[2] | Out-File $file –Append
}
Else
{
$obj | Export-Csv $file -Encoding ASCII -notypeinformation
}
}
$obj = $null
#check for redirects
If ($_.redirectto -ne $null)
{
$obj = New-Object system.object
$obj | Add-Member -name "NetID" -Value $_.alias -MemberType NoteProperty
$obj | Add-Member -name "ForwardType" -Value "Redirct Rule" -MemberType NoteProperty
$obj | Add-Member -name "ForwardAddress" -Value $_.redirectto -MemberType NoteProperty
$obj | Add-Member -name "Enabled" -Value $_.Enabled -MemberType NoteProperty
$obj | Add-Member -name "Description" -Value $c -MemberType NoteProperty
If (Test-Path $file)
{
$mbx.alias + ”,” + ($obj | ConvertTo-Csv)[2] | Out-File $file –Append
}
Else
{
$obj | Export-Csv $file -Encoding ASCII -notypeinformation
}
}
$obj = $null
#check for forwards
If ($_.ForwardTo -ne $null)
{
$obj = New-Object system.object
$obj | Add-Member -name "NetID" -Value $_.alias -MemberType NoteProperty
$obj | Add-Member -name "ForwardType" -Value "Forward Rule" -MemberType NoteProperty
$obj | Add-Member -name "ForwardAddress" -Value $_.forwardto -MemberType NoteProperty
$obj | Add-Member -name "Enabled" -Value $_.Enabled -MemberType NoteProperty
$obj | Add-Member -name "Description" -Value $f -MemberType NoteProperty
If (Test-Path $file)
{
($obj | ConvertTo-Csv)[2] | Out-File $file –Append
}
Else
{
$obj | Export-Csv $file -Encoding ASCII -notypeinformation
}
}
$obj = $null
}
}
}
#increment the start point for the next chunk
$Offset+=$PageSize
#Call the office365 remote session function to close the current one and open a new session
New-O365ExchangeSession $365master
} while($Offset -lt $MbxMax)
