How does shutting the product down get them any customers?
"Hey you've been paying for this calendar thing for a while, but won't be able to any longer. Go use one of their competitors instead. BTW have you tried our CRM?"
To be fair, Salesforce IS a CRM and can offer people project/time/calendar/team collaboration features, even if it's not a DIRECT competitor to a modern wave of time management startups.
To be fair, Salesforce IS a CRM and can offer people project/time/calendar/team collaboration features, even if it's not a DIRECT competitor to a modern wave of time management startups.