Does Outlook Mobile app on iOS share third party Mail Account password with Microsoft Servers

When an IMAP mail account of third party mail providers is configured on the Microsoft Outlook app for iOS or Android, does the Outlook app also make the mail account password and content accessible to Microsoft Servers for Push Notifications or otherwise.

If yes, it makes the security of mail account suspect particularly in case of corporate mail accounts which have strict policies of not sharing or connecting their mail server credentials as well as mail content to or through any third party which may include Microsoft.

Or is it that the Microsoft Outlook App connects directly with the mail servers and other Microsoft Servers are not in the picture.