Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi Jen,
Thank you for posting. May I know which Office 365 Business subscription are you using?
If your Office 365 Business subscription (such as Microsoft 365 Business Standard) included the desktop versions of Office apps for PC. Then you can download and install up-to-date versions of Outlook, Word, Excel, PowerPoint, OneNote for Windows from Office 365 portal.
You may refer to the article for detailed steps: Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac
If anything unclear, please feel free to let us know. We will be glad to help you.
Best regards,
Shyamal