JeremyTBradshaw

# Tackle large sets of objects with a Guid property which can be filtered as a string (e.g., ExternalDirectoryObjectId in Exchange Online).

<# 
    Guids are typically (near)PERFECTLY distributed alphabetically, working from the leftmost character to the rightmost character.
    This means that if you have a large set of objects with a Guid property, you can filter them by the first character(s) of the Guid
    to get perfectly distributed groups of the entire set of objects.

    **NOTE: This is assuming all Guids in the set are generated from a common source (e.g., Active Directory/Entra ID, Exchange/EXO, etc.).

    For example, if we just pick only the 1st character of the Guid, we can get 16 groups (0-9, A-F) of objects.  Each of the 16 groups

JeremyTBradshaw

# https://support.microsoft.com/en-us/office/user-experience-changes-for-sharing-a-calendar-in-outlook-5978620a-fe6c-422a-93b2-8f80e488fdec
reg add HKCU\SOFTWARE\Microsoft\Office\16.0\Outlook\Options\Calendar /v ShowLegacySharingUX /t REG_DWORD /d 1

# https://support.microsoft.com/en-us/office/how-to-revert-the-outlook-desktop-webview-based-room-finder-to-the-legacy-room-finder-e872b6f2-0d36-41ff-861d-adaab2da9c28?ui=en-US&rs=en-US&ad=US
reg add HKCU\SOFTWARE\Microsoft\Office\16.0\Outlook\Options\Calendar /v ShowLegacyRoomFinder /t REG_DWORD /d 0

JeremyTBradshaw

@"
HostControllerService
MSComplianceAudit
MSExchangeADTopology
MSExchangeAntispamUpdate
MSExchangeCompliance
MSExchangeDagMgmt
MSExchangeDelivery
MSExchangeDiagnostics
MSExchangeEdgeSync

JeremyTBradshaw

# Longer version: https://github.com/JeremyTBradshaw/PowerShell/blob/main/Get-BackPressureStatus.ps1
# Reference: https://learn.microsoft.com/en-us/exchange/mail-flow/back-pressure#view-back-pressure-resource-thresholds-and-utilization-levels

$TransportServers = Get-TransportService
$backPressureDiagInfo = foreach ($srv in $TransportServers) {

    [xml]$perServerBPDiagInfo = Get-ExchangeDiagnosticInfo -Server $srv.Name -Process EdgeTransport -Component ResourceThrottling
    foreach ($rsrc in $perServerBPDiagInfo.Diagnostics.Components.ResourceThrottling.ResourceTracker.ResourceMeter) {
    
        $rsrc | Select-Object @{Name = 'Server'; Expression = { $srv.Name } },

JeremyTBradshaw

$IPRegex = @(
    '^(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}', #<-: 0. to 255. (x3)
    '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])', #<---------: 0 to 255
    '($|/([8-9]|[1-2][0-9]|3[0-2]))$' #<-----------------------------: (optional) /8 to /32
) -join ''

$Variations = @(
    # Will match:
    '0.0.0.0',
    '10.0.0.0/8',

JeremyTBradshaw

Windows Registry Editor Version 5.00

;#======#---------------#
;#region# .NETFramework #
;#======#---------------#
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]

JeremyTBradshaw

function ConvertFrom-DistinguishedName ($DistinguishedName) {

    $Domain = ($DistinguishedName -split ',DC=' | Where-Object { $_ -notmatch '^CN=' }) -join '.'
    $CNPath = ($DistinguishedName -split ',DC=' | Where-Object { $_ -match '^CN=' }) -split ',\w\w='
    [array]::Reverse($CNPath)
    ($Domain + '/' + ($CNPath -join '/')) -replace 'CN=' -replace '\\'
}

ConvertFrom-DistinguishedName "CN=Bradshaw\, Jeremy,OU=PowerShell,DC=Sample,DC=code"

JeremyTBradshaw

<#
    .Synopsis
    This is not intended to be an executable script.  It's PS1 for now simply for syntax highlighting.
#>

#======#---------------------------#
#region# Backup LegacyExchangeDN's #
#======#---------------------------#
$LDNRecipients = @()
$Recipients = @()

JeremyTBradshaw

using namespace System
using namespace System.Runtime.InteropServices

########-----------#
#region# Variables #
########-----------#

try {
    $Cred1 = Import-Clixml "$($HOME)\Cred1.xml" -ErrorAction Stop
    Write-Information -MessageData "`$Cred1: $($Cred1.UserName)" -InformationAction Continue

JeremyTBradshaw

# Backup all *.config files.
# Backup all supported OWA customization files:
# https://docs.microsoft.com/en-us/Exchange/clients/outlook-on-the-web/customize-outlook-on-the-web?view=exchserver-2016
# https://docs.microsoft.com/en-us/Exchange/clients/outlook-on-the-web/customize-outlook-on-the-web?view=exchserver-2019

$BackupLocation = "$HOME\Desktop\Exchange_pre-CU_Backup\"
$ExInstallRoot = 'C:\Program Files\Microsoft\Exchange Server\v15\'
$OwaAuthDir = '\FrontEnd\HttpProxy\owa\auth\'
$OwaPremDir = '\ClientAccess\Owa\prem\'