You can change your Outlook password from the Microsoft account security page. If you're using the app, it'll ask you to ...
You can change your signature in Outlook to tailor it to different email recipients. Here's how to do it.
To change the default browser in Outlook 365, go to File > Options > Advanced, then scroll to “Link Handling” and set “Open hyperlinks from Outlook in” to your preferred browser, like Chrome.