...
Please note, *.xls files have html format so xls viewers might alert users about it before opening. It is not an issue, just press Yes.
...
It is possible to configure columns in exported in User Preferences or app Configuration - Default User Settings, see Columns For Export option.
...
To send email just press envelop icon under blue navigation control. It is possible to send it now or schedule it, update or unsubscribe.
...