Except I know how expensive it is and companies like mines still do it?
I work in IT and in charge of getting quotes from of software upgrades our vendors? We performed the migration from Exchange 2010 -> 2013 -> 2016. I also get to see the IT budget from our CTO. You also need to realize that the cheapest solution isn't always the best solution because you need to factor in users experience, email server migration cost, and support. Upgrading is the easiest way forth. Speaking as a sys admin. If none of these were a factor there are plenty of free open sourced email servers people would use.
ArcMail great in demand? You do realized that been founded on 2005 and they racked up $2mil in sales. They had that figure when they were a subsidiary of iGambit as well back in December 2016 - see their filing. Let that sink in. Zero growth. The projected '$2 million in revenue over the next twelve months' means they won't be growing much this year either.
Besides, what does it even matter regarding GDPR with email. You are making it seem as if companies sell emails/emails that they archived. Things like Exchange is mainly for employee use, you don't usually give it out to customers. Fact is that it doesn't make any sense to incorporate ClassiDoc into any of the email stuff.
ArcMail is an enterprise archiving email solution. That is the same as Barracuda (which we use), or any other archiving emails solution, which don't need GDPR compliance. Never heard of such thing. Not that you would give customers an Exchange account to begin with, anyway.
