I was helping her set it up, and after creating and starting the migration following all the DNS MX SPF DKIM changes, went to enable IMAP in the Control Panel. I know from having used Zoho for 5 years that though IMAP access is always included, for some reason it is never defaulted to on, only POP. 

To my surprise, I see that POP and IMAP are both disabled. No problem, I think. I go to enable each one and to my disgust and dismay, discover that "Available exclusively with paid plans" pops up instead. No POP, No IMAP, no SMTP, it turns out that Zoho Free is now only a crummy substandard webmail-only plan. Maybe webmail and your own app, but utterly locked out of any "real email programs". Not what I had, not what most of us had, not what anybody expected they were referring as a good thing. 

NO PRIOR NOTICE. (Yes, that is yelling. I'm quite upset at your sneaking in this degradation of what you offered.) 

Anyone of us Zoho Free users likely expects that when we refer someone new to Zoho to use the same service with which we have been very satisfied, she or he is going to get the same service. 

There was no message there that IMAP and POP are no longer included (and obviously not SMTP either anymore.) Even on the signup plan choice, there's a positive note of "webmail access" but by any sensible expectation, the classic "reasonable person" (as the lawyers love to say in court) expects that means, "Oh that's lovely, they also have webmail, how convenient", not, "Oh no, it is ONLY webmail." 

Please reverse this really bad policy. It is not going to help you get new paying customers, it is just going to block off the inflow of new customers overall. Your free service has sufficient limits, especially on overall storage space, that there are plenty of incentives for upgrading if people discover they really like Zoho and start using you a lot more, including docs and file space. Also, for significantly growing small but many-employees businesses. 

Shutting off "normal email access" (POP, IMAP, SMTP are what is "normal" in the email world) just is going to anger and dismay existing customers enough that you won't get nearly as many referrals anymore. Plus we won't trust that you won't suddenly change the terms of the deal for existing users. I know that I will be warning all my existing referred users, who are at present quite happy with Zoho, to consider getting out from you before you take away what they have.

At minimum, you should have done very obvious notifications, not fine print in misleading ways, for many months, including a proactive message upon referral BY a free-with-IMAP user TO a new user that their referred colleague was going to get a lousy bad plan in comparison to what the referrer had. 

And anybody who got referred without that should immediately get an upgrade, not to the full features of the paid plan, but to the features of the old free plan. 

I feel both cheated by you, and that my professional credibility was damaged by you, due to this inadequately announced degradation of what I referred, thinking it was the "real Zoho" plan. I fully expect you to fix my latest referral's account to have those capabilities on her free plan. (Everybody else's too, I would hope, as there is a whole class of people who probably were damaged by your inadequately disclosed action.) And then to start making a better announcement in advance, a real announcement, really in advance, so that we existing users don't get fooled into referring someone to something that is no longer as good as what we thought it was. 

Please do the right thing. Make it right for recent referrals, defer this change until you have given many months of really OBVIOUS notice. Then it's all fine, then people can make smart decisions about whether to refer you and to what kind of plan to use in the referral.