Explanation/Reference:
Explanation:
Use IIS Manager to simplify the Outlook Web App URL and force redirection to SSL Start IIS Manager.

Expand the local computer, expand Sites, and then click Default Web Site.

At the bottom of the Default Web Site Home pane, click Features View if this option isn't already

selected.
In the IIS section, double-click HTTP Redirect.

Select the Redirect requests to this destination check box.

Type the absolute path of the /owa virtual directory. For example, type https://mail.contoso.com/owa.

Under Redirect Behavior, select the Only redirect requests to content in this directory (not

subdirectories) check box.
In the Status code list, click Found (302).

In the Actions pane, click Apply.

Click Default Web Site.

In the Default Web Site Home pane, double-click SSL Settings.

In SSL Settings, clear Require SSL.Note: If you don't clear Require SSL, users won't be redirected

when they enter an unsecured URL. Instead, they'll get an access denied error.
References: