I have 1,341 unread emails in my inbox 
I have only 7 unread messages in Spark. 
Why is this? Because in eMail, I get various levels of Spam: Full-on spam, as well as internal spam from “well meaning” individuals pummeling my productivity. You know who you are, emailer to ww-sales-all@company.com
Most of this spam comes in because I am on someone else’s email recipient list. I have no control.
In Spark I get to choose the rooms I’m in, and for which I get notifications. If a room is noisy, I can mute it or leave.
For Email, I have to try unsubscribe, or ask someone to remove me.
Content and messages are inherently in their associated Spark room for the topic.
I have to rely on “smart technology” to do the same in Email. To manage an email message (which is just one in my list of tens of thousands) I have to rely on client based threading, spam filters and inbox rules.
Spark turns communications inside out. YOU are in control, not the sender.
PS: Spark security inherently and radically reduces occurrences of phishing and also has integrated voice, video, screen sharing, e-2-e security, remote room system control, calendar and all this is fully integrated to my iOS 10 mobile device.