Most Salesforce Lightning migrations stall not because of bad technology — but because of avoidable, well-documented pitfalls that catch teams off guard. RASPSYS has guided dozens of businesses through exactly these hurdles, and we know which ones bite hardest. Here is what to watch for, and how to come out clean on the other side.
1. Classic-Only Features That Break in Lightning
Salesforce Classic was built over two decades, and a surprising number of features never made the journey to Lightning. If your team relies on tools like Salesforce Console for Service Cloud in its Classic form, certain email-to-case workflows, or legacy Visualforce pages with Classic-specific dependencies, you will hit friction the moment you flip the switch.
The danger is assuming a "like-for-like" migration. It is not. Classic configurations that worked perfectly for years may render incorrectly, behave unexpectedly, or simply fail to appear in Lightning Experience.
RASPSYS starts every engagement with a deep-dive audit of your existing Classic setup. We map every feature, page layout, and process against Lightning compatibility — before a single change is made to your org. Nothing gets left to chance.
- Full Visualforce page compatibility assessment
- Console layout and macro compatibility review
- Email workflow and case management audit
- Process Builder and workflow rule evaluation
- Third-party app and AppExchange package checks
Get a free Classic-to-Lightning compatibility audit from RASPSYS →
2. Custom JavaScript Buttons That Stop Working
This is one of the most common — and most disruptive — salesforce lightning migration challenges we encounter. Businesses that have spent years building out custom JavaScript buttons in Classic are often blindsided when those buttons simply do not function in Lightning Experience.
Lightning does not support inline JavaScript in custom buttons and links the way Classic does. Every single custom JS button needs to be rewritten as a Lightning component — typically a Lightning Web Component (LWC) or Aura component. For orgs with dozens of these, the rework can be substantial if it is not planned for upfront.
RASPSYS inventories all custom JavaScript buttons in your org and rebuilds each one as a properly scoped, performant Lightning component. We prioritise by business impact so your most critical functions are live first — and nothing falls through the cracks.
- Full inventory of all custom button and link logic
- Impact-ranked rebuild schedule
- LWC rewrites tested in a sandbox before deployment
- Documentation so your team can maintain them going forward
Let RASPSYS rebuild your custom JS buttons as Lightning components →
Let RASPSYS Handle Your Salesforce Lightning Migration End-to-End
From pre-migration audit to post-go-live support, RASPSYS delivers migrations that stick — on time, on budget, and with zero nasty surprises for your users.
3. User Resistance and Adoption Failure
The technology can be perfect and the migration can still fail. User resistance is one of the most underestimated salesforce lightning migration challenges — and it is entirely human. Sales reps, service agents, and ops staff who have used Classic for years will push back on a new interface, especially if they were not involved in the rollout planning.
Low adoption does not just slow your ROI — it breeds workarounds, data inconsistencies, and shadow systems. Teams revert to spreadsheets. Managers lose visibility. The gains from Lightning never materialise.
RASPSYS bakes adoption into the migration plan from day one. We run role-based training sessions tailored to how each team actually uses Salesforce. We create quick-reference guides, run walk-through workshops, and set up feedback channels so users feel heard rather than steamrolled. Your people will not just tolerate Lightning — they will prefer it.
- Role-specific training for sales, service, ops, and admin teams
- Executive sponsor alignment and change communication planning
- Quick-reference Lightning guides for power users
- Feedback loop setup to catch friction points early
- 30-day post-launch check-ins to sustain momentum
Ask RASPSYS how we drive Lightning adoption across your team →
4. Missing or Incomplete Lightning Equivalents
Not every Classic feature has a direct Lightning counterpart — and some that do exist in Lightning are not yet at feature parity. Teams often discover mid-migration that a reporting view they relied on daily, a specific list view behaviour, or a niche console feature is simply not available in Lightning the same way.
This creates a painful choice: delay the migration, abandon the feature, or find a workaround fast. Without expert guidance, businesses make expensive decisions under pressure and compromise processes that were working well.
RASPSYS identifies every gap before the migration begins. Where a direct equivalent does not exist, we design a Lightning-native solution that replicates — and often improves on — the original functionality. We never leave your team without a working replacement.
- Gap analysis mapped against your actual workflows
- Custom Lightning components where native equivalents fall short
- AppExchange solution review to fill functionality gaps cost-effectively
- Process redesign that improves on Classic workflows, not just replicates them
See how RASPSYS fills Lightning feature gaps without slowing your migration →
5. Data Integrity Issues During Migration
A Lightning migration is not just a UI change — it touches how your data is displayed, related, and sometimes even stored. Migrating field configurations, custom objects, and record types without proper validation can surface data quality problems that were hidden under Classic's more forgiving display logic.
Duplicate records become visible. Required fields that Classic allowed to be blank now break validation rules. Page layouts referencing deprecated fields throw errors. These issues do not just create admin headaches — they erode user trust in the system at the worst possible moment.
RASPSYS runs data validation checks before, during, and after migration. We clean duplicates, resolve field conflicts, and test every record type against Lightning's stricter validation model. When we hand over your org, it is clean — not just moved.
- Pre-migration data audit and duplicate detection
- Field and validation rule compatibility testing
- Record type and page layout conflict resolution
- Full UAT (User Acceptance Testing) in a sandbox environment
- Post-migration data integrity verification before go-live sign-off
Get RASPSYS to validate your data before you migrate to Lightning →
Ready to Move to Lightning Without the Headaches?
RASPSYS delivers end-to-end Salesforce Lightning migrations for businesses across the UK, US, UAE, Canada, and Australia. We handle every challenge on this list — and the ones you have not thought of yet. Book your free consultation today and move forward with confidence.