Long term zoho users: How often is Zoho mail updated?

Long term zoho users: How often is Zoho mail updated?

As someone testing out Zoho mail as an alternative to Gmail etc I have been spending some time reading forum posts, responses, usability etc.

I see many posts here get an answer, and usually quite nice, though not always directly answering the question.

In regards to the GUI and usability. Can any long term users of Zoho mail give an indication on how often they see improvements made to Zoho mail?

There seem to be numerous forum posts about things like priority inboxes, improved flags, colored labels, and delete mail buttons, amongst others. However the above are some of my main GUI questions too, hence I am repeating them. Most forum posts have the same reply, "we'll add it to our list"

So in closing, my question remains: long term users, how often do you see improvements in Zoho mails interface and usability?