Allow ms-outlook links

Hello AlexKleshcheov

welcome to the Microsoft community, my name is Recep I'll be happy to help you today.

I understand that you want to confirm if there is any other way to open Outlook App from Teams

Please note that there is no Outlook app, best you can do is add the OWA URI as a "tab", but it's a broken experience. Simply use OWA/Outlook, Teams was not designed to work with email anyway.

As far as I know if you want to open your Office 365 Outlook Web App in the Teams, you can try to add a tab called “Website" into your Team channel, and then enter the Outlook Web App URL into the website, for your reference 

You can click "+" to add the Website tab into your Teams channel, and then enter the URL you need as mine.