5 efiles is an IRS limit per computer and email address. I think it's to prevent fraud and people filing a lot of fake returns.
And to prepare more than five e-files, you will need to sign up with the IRS as an ERO - an Electronic Returns Originator. How to become an Authorized E-file Provider…..
http://www.irs.gov/Tax-Professionals/e-File-Providers-&-Partners/Become-an-Authorized-e-file-Provide...
If you need to efile more you have to buy Intuit Products for Tax Professionals https://taxpro.intuit.com
