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# Remember to run the script "as Administrator"
$AdminNote1 = Read-Host 'Are you running this script in Powershell as administrator? (Yes/No)'
$pathExclusions = New-Object System.Collections.ArrayList
$processExclusions = New-Object System.Collections.ArrayList

$pathExclusions.Add('C:\Windows\Microsoft.NET') > $null
$pathExclusions.Add('C:\Windows\assembly') > $null
$pathExclusions.Add($env:USERPROFILE + '\AppData\Local\Microsoft\VisualStudio') > $null
$pathExclusions.Add($env:USERPROFILE + '\.nuget\packages') > $null
$pathExclusions.Add('C:\ProgramData\Microsoft\VisualStudio\Packages') > $null

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Install-Module ExchangeOnlineManagement
Install-Module -Name MicrosoftTeams
Install-Module AzureRM -AllowClobber
Install-Module -Name Microsoft.Online.SharePoint.PowerShell
Install-Module -Name AzureAD

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#Install and connect:
Install-Module ExchangeOnlineManagement
Import-Module ExchangeOnlineManagement
Connect-ippssession -UserPrincipalName youremail@domain.com #replace youremail@domain.com with your own. Make sure you have access/permission/roles.
Connect-ExchangeOnline -UserPrincipalName youremail@domain.com #replace youremail@domain.com with your own. Make sure you have access/permission/roles.

#Find all:
Get-UnifiedGroup | Select DisplayName,@{Name="NameLength";Expression={$_.name.length}}, Alias, PrimarySmtpAddress, HiddenFromExchangeClientsEnabled

#Find specific:

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#Instructions for both O365 Groups and Distribution Lists

#For O365 Groups:
#1.a Find specific group name. Replace put group name here with the name of the group.
Get-UnifiedGroup -Identity "put group name here" | Select Name,@{Name="NameLength";Expression={$_.name.length}}, EmailAddresses, Alias, ServerName, AccessType

#1.b List all groups with names. 
Get-UnifiedGroup | Select Name,@{Name="NameLength";Expression={$_.name.length}}, EmailAddresses, Alias, ServerName, AccessType

#2. Add mail address. Replace put group name here with the name of the group. Replace putmail address here with the new mail address.

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New-UnifiedGroup -DlIdentity "insert name of Distribution List here" –ConvertClosedDlToPrivateGroup:$true -DeleteDlAfterMigration

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#Get list of Room Lists for Room Finder in Outlook
Get-DistributionGroup -ResultSize Unlimited | Where {$_.RecipientTypeDetails -eq "RoomList"} | Format-Table DisplayName,Identity,PrimarySmtpAddress -AutoSize
#Get list of Rooms
Get-Mailbox -RecipientTypeDetails RoomMailbox

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(Get-DistributionGroup).identity | ForEach-Object{
$DistributionGroupName = $_
Get-DistributionGroupMember -Identity $_ | ForEach-Object{
[PSCustomObject]@{
DistributionGroup = $DistributionGroupName
MemberName = $_.Name
#Other recipient properties here
}
}
}

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get-mailbox -id <replace brackets and contents with mail address> | select whenCreated

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#Get all mail aliases for group:

#Distribution Group:
Get-distributiongroup <replace brackets and contents with Group name> | select -ExpandProperty EmailAddresses

#O365 Group:
Get-UnifiedGroup <replace brackets and contents with Group name> | select -ExpandProperty EmailAddresses

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$Groups = Get-UnifiedGroup -ResultSize Unlimited | Select DisplayName, Alias, PrimarySmtpAddress, HiddenFromExchangeClientsEnabled
Write-Host "Processing" $Groups.Count "groups"
$Report = @()
$TeamsGroups = 0
$NoConvHistory = 0
ForEach ($G in $Groups) {
   Write-Host "Processing" $G.DisplayName 
   If ($G.HiddenFromExchangeClientsEnabled -eq $true) { # Used to be HiddenFromExchangeClients
      $ChatCheck = $Null
      $ChatCheck = (Get-MailboxFolderStatistics -Identity $G.Alias -FolderScope ConversationHistory -IncludeOldestAndNewestItems)