If you are an IT manager like I do, you sometimes need to execute commands in PowerShell because it’s just don’t exist in the admin center UI. And if you’re working on (and new on) a Mac like I do, it’s not easy to do.

This is a documentation of the steps I went through to install everything from scratch until I am able to execute Microsoft admin command in PowerShell running on a Mac.

Today is 24 February 2025 and I am running Mac OS Sequoia on an M2 Macbook Pro.

Open Terminal

• If you don’t know it yet, open Terminal (like a cmd in Windows) by pressing Command-Space and type Terminal.

Install HomeBrew

• In the terminal, type this command and press enter:
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)";
• 
• Wait until it finishes.
• After it completes, to test it, type this command and press enter: brew
• If it shows example usages of brew, you’re good to continue to the next step.

Install PowerShell

• In the terminal, type this command and press enter:
  brew install powershell/tap/powershell
• Wait until the installation finishes.
• If that didn’t work the first time, try closing your Terminal, open a fresh one, and try the command again.
• After it completes, to test it, type this command and press enter: pwsh
• If it shows the PowerShell version, you’re good to continue.

Install OpenSSL

• In your terminal, type this command and press enter:
  brew install openssl@3
• If by the time you are installing, OpenSSL 3 is not the latest, use the latest version. Check from here and type OpenSSL on the search box: https://formulae.brew.sh/formula/openssl@3#default

Opening PowerShell

• In your terminal, open PowerShell in Super User mode with this command and press enter:
  sudo pwsh
• 

Install Exchange Online PowerShell Module

• In your PowerShell, type this command and press enter:
  Install-Module -Name PSWSMan
• Do it again for this command:
  Install-WSMan
• Again, with this command:
  Install-Module -Name ExchangeOnlineManagement -Scope CurrentUser

Connect to your Microsoft 365 subscription

• Type this command, change the <UPN> with your admin email address, and press enter:
  Connect-ExchangeOnline -UserPrincipalName <UPN>
• A Safari window will open, sign in with your Microsoft Account

That’s it!

You should be able to run a PowerShell admin command now.

Sample command: Get-Mailbox -ResultSize unlimited -Filter "RecipientTypeDetails -eq 'RoomMailbox'" | Get-CalendarProcessing | Format-List Identity,ScheduleOnlyDuringWorkHours,MaximumDurationInMinutes