Salesforce has made it clear: Classic is on its way out. Orgs still running Classic are operating on borrowed time — and the longer they wait, the harder and riskier the migration becomes. This guide cuts through the noise and tells you exactly what a Salesforce Classic to Lightning migration involves, what can go wrong, and how RASPSYS makes the transition safe and fast.
Why Salesforce Classic Is Being Retired — and Why You Cannot Wait
Salesforce has been signalling the end of Classic for years. New features, AI capabilities, and security enhancements are built exclusively for Lightning Experience. Classic is no longer receiving meaningful investment — and Salesforce has begun enforcing Lightning-only access for new orgs and rolling out auto-switches for existing ones.
For businesses still on Classic, this is not a "nice to have" upgrade. It is a forced migration with a shrinking window. Every month you delay, the gap between your environment and the current Salesforce platform widens — making the eventual move more expensive and disruptive.
RASPSYS has guided dozens of organisations through this exact transition. The message is consistent: teams that migrate proactively have far smoother experiences than those scrambling after an auto-switch catches them unprepared.
Check if your org is at risk — talk to RASPSYS →
What the Migration Actually Involves
A Salesforce Classic to Lightning migration is not a simple toggle. It is a structured programme that spans assessment, remediation, testing, training, and cutover. Skipping any phase is where organisations get burned.
RASPSYS structures every migration across three core phases. First, a Lightning Readiness Assessment — we audit your org, run Salesforce's readiness report, and identify every component that needs attention before you can safely switch. Second, a remediation sprint — we update, replace, or retire components that are not Lightning-compatible. Third, a controlled rollout — we enable Lightning for pilot users, gather feedback, resolve issues, and execute a full cutover with zero data loss.
- Lightning Readiness Assessment and org health audit
- Identification of Classic-only features in active use
- Visualforce page and S-Control remediation
- Custom button and JavaScript button replacement
- User acceptance testing in a sandbox environment
- Phased rollout with rollback capability at every stage
See how RASPSYS structures Lightning migrations →
Let RASPSYS Handle Your Salesforce Lightning Migration
Migration failures are costly. RASPSYS brings proven methodology, certified Salesforce consultants, and hands-on experience across UK, US, UAE, Canada, and Australia — so your transition is controlled, not chaotic.
What Breaks During Migration (And What Does Not)
This is the question every IT director needs answered upfront. The honest answer: plenty can break if you go in blind. Salesforce Classic and Lightning are built on fundamentally different UI frameworks. Components that work seamlessly in Classic may render incorrectly, behave unexpectedly, or fail entirely in Lightning.
Common breakage points include: JavaScript buttons (not supported in Lightning), Visualforce pages not optimised for Lightning layout, S-Controls (fully deprecated), and custom sidebar components. Integrations that rely on Classic URLs or specific API behaviours also require review.
What does not break: your data, your standard Salesforce objects, most declarative automation (flows, validation rules, approval processes), and well-built Apex classes. RASPSYS knows exactly where to look — and we document every risk before a single line of code is changed.
- JavaScript buttons — must be replaced with Lightning actions
- S-Controls — fully deprecated, require full rewrites
- Unstyled Visualforce pages — need Lightning Design System updates
- Classic-only report types and dashboard components
- Custom console components built for Salesforce Console (Classic)
Get a full risk assessment from RASPSYS →
How to Prepare Your Org for a Smooth Transition
Preparation is everything. Organisations that walk into a Lightning migration with a clear inventory of their customisations, a trained user base, and a tested sandbox consistently outperform those that treat it as an IT-only project.
Start by running Salesforce's Lightning Experience Transition Assistant — it surfaces readiness issues directly in your org. Then conduct a full customisation inventory: list every Visualforce page, every custom button, every integration endpoint, and every AppExchange package in use. Check each for Lightning compatibility. Do not assume — verify.
RASPSYS recommends involving end users early. Change resistance is one of the biggest causes of failed rollouts. When sales reps and operations managers understand the productivity gains — faster page loads, built-in Einstein AI, drag-and-drop dashboards — adoption accelerates dramatically. RASPSYS includes user training and change management as standard in every migration engagement.
Start your migration preparation with RASPSYS →
Why Businesses Trust RASPSYS for Lightning Migration
A Salesforce Classic to Lightning migration touches your CRM, your sales process, your customer data, and your team's daily workflow. It is not a project to assign to an overloaded internal admin or hand off to a generalist consultancy with no Lightning track record.
RASPSYS specialises in Salesforce migrations. Our certified consultants have executed Lightning transitions for businesses across the UK, US, UAE, Canada, and Australia — spanning financial services, professional services, manufacturing, and healthcare. We bring a structured methodology, transparent project plans, and defined success criteria to every engagement.
We do not just flip the switch and leave. RASPSYS provides post-migration support, monitors adoption, and resolves issues that surface in the first weeks after cutover. Our clients move to Lightning with confidence — because we have done the hard work before go-live, not after.
- Certified Salesforce consultants with Lightning migration specialisation
- Fixed-scope assessment engagements — no open-ended billing surprises
- Full sandbox testing before any production changes
- Change management and user training included
- Post-migration support and adoption monitoring
- Clients across UK, US, UAE, Canada, and Australia
Work with RASPSYS on your Lightning migration →
Ready to Migrate from Classic to Lightning — Without the Risk?
RASPSYS delivers end-to-end Salesforce Classic to Lightning migrations for businesses across the UK, US, UAE, Canada, and Australia. Book a free consultation today and get a clear picture of what your migration involves, what it will cost, and how long it will take — before you commit to anything.