The 'Turn on Lightning Experience' critical update will enable Lightning Experience for all orgs that haven't already done so.
This critical update will start activating on a rolling basis on January 7, 2020 and will finish for all orgs by January 31, 2020. Orgs that have Lightning Experience-supported editions and user licenses are affected.
All new Salesforce innovation happens only in Lightning Experience. We encourage you to transition fully to Lightning Experience and start benefiting from everything it has to offer.
You get hundreds of new and exclusive features that increase value and deliver a return on investment in strategic areas (such as revenue per rep, faster and less expensive development time, and keeping your org aligned with business and process changes), operational areas (such as improved win rates and greater opportunity pipeline), and overall Salesforce adoption by end users, which reduces overhead and support needs. And the sooner you transition, the less technical debt you'll build up!
This critical update is not a forced transition. Salesforce Classic isn't going away, and you have full control over which users get access when Lightning Experience is turned on. Take advantage of the time before the update is activated to verify your org's readiness and prepare your users.
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