One of my clients asked if they really needed Gmail for business.  After thinking about it for a minute, I realized why I use it for my business.  My personal decision to choose google business included these factors:

The number 1 reason is the SPAM filtering Google has – saves me at least an hour per day skimming unnecessary emails
The virus protection is very good, better than most filters
I retired my server in my office and moved to using Google docs to store shared files – I dropped the $150 per month to have it backed up off site and all the cost to maintain it
The calendar functions for shared events and integrating with other vendors like vCita and are super easy with Gmail – plus I like the way it shows up on my phone
Gmail has never let me down on me like ALL other previous email has (including my own in house server and webmail) – undeliverable, bounce-backs, etc.
I am saving storage on my computer
I do not have to back up my email to have it years later
Plus all the other apps it includes, attached to your gmail:

Google My Business
Google analytics
Google hangouts, etc.

Finally their free support is off the charts, by phone

I am a fan.  Click here if you would like a free trial.