Hi @Clare Smith
Welcome to our forum!
Please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. The following is for your reference.
Microsoft Office is a suite of software applications that includes Word, Excel, Outlook, and more. Microsoft 365 is a subscription service that gives you access to the latest versions of these applications, along with cloud storage, collaboration tools, and other benefits. More information, see: What's the difference between Microsoft 365 and Office 2021? - Microsoft Support.
Learn more from the following paths: https://learn.microsoft.com/en-us/training/browse/.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.