Setup outlook web app, OWA is known as Outlook Web App, Outlook Web Access is a browser based email client. Outlook on the web you can access your Exchange Server user mailbox from approximately any web browser.
Setup Outlook Web App
1- If you receive the following certificate warning page, click Continue to this website (not recommended) to continue to open OWA.
2- On the Outlook Web App sign-in page, type your user name and password and then click Sign in.
3- Select the language > select time zone and then click Save.
4- For testing new email click New.
5- Type email address > type Subject and then click Send.
6- Received Email and click reply.
7- After Reply
For more details click here