New window to see e-mails, calendar and contacts at same time

Good morning

I would like to see eMClient allowing us to create new windows to make possible see at same time, e-mail, calendar and contats, for example.
Only with Control + Tab, I would like to change to another window with calendar, and control + tab again go to window with e-mail, and control + tab again go to contats.

This should be a great feature in my point of view.

Thank you