When you share a SalesMail video using the SalesMail desktop portal, it will automatically open a new email draft using whichever application is set as your default email application on your computer.  To change your default mail app, go to 'Settings' -> 'Default Apps' -> Email App.  Then click whichever app is currently set as default and it will bring up a menu of choices.  Choose the application you use for your work email (this is often Microsoft Outlook).  The next time you go to share a SalesMail, it will use the default mail app you have selected.