Install Microsoft Outlook application from Appstore https://apps.apple.com/ru/app/microsoft-outlook-email-calendar/id951937596

Launch Outlook. Enter your email and click Add Account

Fill in the information to configure the connection to Exchange. In some cases, your username is different from your email address, for example, Lastname_N. If you don't know your username, contact technical support helpdesk@1ci.com

Click Maybe Later.