Do you support Salesforce Classic?

We have followed Salesforce direction on this and built Email Made Easy (Mailchimp) to be Lightning only.  This is largely due to Salesforce investment in the Lightning UI releasing features that only work in the new design. To be honest it has meant that we have been able to build some great features that would could not build in classic.  I don't think Salesforce has given a date when it will retire classic but they certainly making it best practice for developers to use.
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