Tabs3 to MATTEROOM Migration Guide for Law Firms
A controlled approach to moving legal billing, accounting, matter, and historical data from Tabs3.
Overview
A Tabs3 to MATTEROOM migration should protect billing continuity and financial integrity while giving the firm a controlled path into a new operating environment. Tabs3 may contain billing, accounting, case-management, payment, document, calendar, and conflict information. The exact migration scope depends on the products and modules the firm uses.
Do not assume that every Tabs3 environment is the same or that it is desktop-only. Before planning the migration, document the current product, edition, release, modules, integrations, and deployment model.
What the Source Supports About Tabs3
The available source material describes Tabs3 as supporting cloud practice management, billing, accounting, case management, electronic payments, matters, calendars, document management, conflict checking, optional CRM, multiple rate and fee approaches, and customizable statements.
MATTEROOM's supported positioning includes time, billing, documents, workflows, configurable legal accounting, analytics, Microsoft 365 integration, single tenancy, encryption, and migration services. Discovery should establish which Tabs3 functions are active today and how each one will be handled in the target design.
The Five-Phase Migration Plan
Phase | Primary objective | Required outcome |
1. Inventory | Establish the exact Tabs3 environment and data footprint. | A signed-off source inventory that supports scope and estimates. |
2. Classify | Decide what moves, what is summarized, and what remains archived. | A retention and migration decision for every data domain. |
3. Map | Define how source records become MATTEROOM records. | Approved mappings, transformations, owners, and exceptions. |
4. Clean | Resolve avoidable quality problems before conversion. | A controlled source dataset with documented exceptions. |
5. Trial conversion | Test extraction, transformation, loading, reconciliation, and workflows. | Evidence that the final cutover can be executed and validated. |
Phase 1: Inventory the Current Tabs3 Environment
Build one source inventory before estimating effort or choosing a cutover date.
Inventory area | Record and validate |
Platform | Product names, edition, release, deployment model, modules, and integrations. |
Scale | Client count, matter count, time volume, document volume, and report inventory. |
Financial position | WIP, invoices, A/R, trust, GL, payments, and unapplied cash. |
Configuration | Rates, custom fields, codes, statement formats, workflows, and permissions. |
Ownership | Business owner, technical owner, source location, and approval responsibility for each domain. |
The completed inventory becomes the basis for migration scope, estimates, reconciliation design, and responsibility assignment.
Phase 2: Classify the Data
Choose a treatment for every data domain rather than applying one migration rule to the entire system.
Treatment | Appropriate use |
Migrate full history | Users need detailed history in MATTEROOM for ongoing work, reporting, or service continuity. |
Migrate open balances | Operational continuity requires current WIP, A/R, trust, cash, or other open items, but not every closed transaction. |
Migrate summarized history | Comparative or management reporting needs totals without transaction-level detail. |
Keep a read-only archive | Retention or audit access is required, but the records do not need to be active in MATTEROOM. |
Exclude | The data has no valid operational, financial, audit, or retention purpose. |
The final decision should reflect operational needs, financial controls, audit obligations, retention rules, and the cost of carrying unnecessary history.
Phase 3: Map Tabs3 to the Target Model
Create explicit mappings for the people and matter structure; time, expenses, WIP, invoices, and A/R; payments, unapplied cash, trust, and GL; and documents, reports, codes, and custom values.
Mapping domain | Typical source objects | Approval owner |
Identity and matters | Clients, matters, contacts, users, and timekeepers. | Firm operations and matter administration. |
Billing | Time, expenses, WIP, invoices, rates, and fee arrangements. | Billing and finance. |
Accounting | A/R, payments, unapplied cash, trust, GL, and opening balances. | Controller, finance lead, or designated accounting owner. |
Content and reporting | Documents, metadata, reports, codes, and custom fields. | Records, IT, reporting, and the relevant business owner. |
Every unmapped value, transformation, default, and exception should have a named business owner and an approval decision.
Phase 4: Clean the Data
Migration is an opportunity to reduce unnecessary complexity rather than reproduce it automatically. Complete targeted cleanup before the trial conversion:
Resolve duplicate clients, matters, and documents.
Review inactive users, old codes, obsolete custom values, and records without a current business purpose.
Correct invalid rates, missing currencies, orphan transactions, and incomplete ownership information.
Investigate trust differences and other financial exceptions before they enter the target system.
Record anything intentionally left unresolved in the migration exception log.
Phase 5: Run a Trial Conversion
MATTEROOM's migration framework recommends a trial load before final cutover. The trial should produce evidence, not only a successful import message.
Test area | Evidence to retain |
Extract and transform | Source totals, transformation rules, rejected records, warnings, and exception owners. |
Load and performance | Load duration, record counts, failures, restart approach, and expected cutover timing. |
Reconciliation | Signed comparisons for financial and operational domains. |
Reports and integrations | Required reports, interfaces, security roles, and downstream results. |
User workflows | End-to-end scenarios completed by representative users with documented outcomes. |
Maintain one exception log with severity, owner, resolution, retest status, and sign-off.
Financial Reconciliation
Domain | Required comparison |
Time | Period, matter, and timekeeper. |
Expenses | Period and matter. |
WIP | Firm, client, and matter. |
Bills | Fees and costs. |
A/R | Client, matter, invoice, and aging. |
Cash | Applied and unapplied. |
Trust | Bank, client, and matter. |
GL | Trial balance and opening balances. |
Reports | Required operational and management outputs. |
Do not move to go-live because record counts “look close.” Define tolerances, investigate differences, and obtain sign-off from the appropriate financial owner.
Billing Configuration
Document the Tabs3 billing logic that must survive or be deliberately redesigned: rates, fee arrangements, statement formats, discounts, tax, prebill processing, approvals, payments, write-offs, and client-specific requirements.
UAT should include the firm's hardest realistic bill. This is more useful than testing only a simple standard invoice because it exposes configuration, approval, tax, rate, and presentation issues before cutover.
Documents and Matter Management
If the Tabs3 environment includes document or case-management functions, make the future-state decisions explicit.
Decision | What to confirm |
Migration scope | Which documents move, which remain archived, and whether email is included. |
Structure | Whether folders, matter relationships, versions, and document groupings are preserved or redesigned. |
Metadata | Which fields remain useful, how values are normalized, and what becomes searchable. |
Permissions | How source access maps to MATTEROOM and Microsoft 365 security groups or roles. |
Historical access | How users find closed matters, archived documents, and prior correspondence after go-live. |
MATTEROOM's Microsoft 365 and OneDrive positioning can be evaluated as part of the target document design rather than treated as a separate afterthought.
Microsoft 365 Workstream
MATTEROOM source materials describe Teams-, Planner-, OneDrive-, and Copilot-oriented integration. A migration can therefore include a future-state design for identity, matter provisioning, Teams, OneDrive, Outlook filing, Planner, permissions, retention, search, and matter closure.
Test that design against the firm's Microsoft governance rules, retention requirements, naming conventions, access model, and matter-opening and matter-closing processes.
UAT and Cutover
UAT should cover complete workflows, not isolated screens.
Workflow | What users should validate |
Matter opening | Create the matter, assign people and permissions, and confirm required metadata. |
Time and expenses | Enter, review, edit, approve, and report time and expense activity. |
Billing and payment | Run prebill, produce the final bill, apply payment, and confirm A/R. |
Trust and accounting | Complete representative trust and journal scenarios and validate reporting. |
Documents and Microsoft 365 | File, retrieve, search, share, and secure matter content. |
Security and reporting | Confirm role-based access and the reports required by lawyers, management, and finance. |
After UAT, define the final freeze, extract, load, reconciliation, access switch, communications, rollback criteria, and post-go-live support ownership.
Commercial and Timing Claims
Pricing comparisons require current like-for-like quotes and comparable implementation scope. Avoid universal “migration in hours” claims: timing depends on the supported source environment, data scope, history, volume, transformations, documents, integrations, reconciliation, UAT, and cutover requirements.
A responsible proposal should state | Examples |
Source and scope | Products, editions, modules, integrations, data domains, and history included. |
Assumptions | Data quality, access, availability of subject-matter experts, and required extracts. |
Deliverables | Mappings, trial conversions, exception logs, reconciliations, reports, and training. |
Acceptance | UAT scenarios, tolerances, approvers, sign-off, and rollback criteria. |
Timing and ownership | Dependencies, freeze period, cutover window, stabilization period, and responsible teams. |
Related MATTEROOM Resources
Continue with | Use it for |
The complete discovery-to-stabilization migration process. | |
Detailed financial migration and reconciliation planning. | |
Evaluating billing capabilities and selection criteria. | |
Additional guidance for accounting, documents, workflow, security, and operations. |
For the next evaluation step, review Law Firm Financial System Migration Checklist and How to Migrate WIP, A/R and Trust Balances to a New Legal System. Compare the relevant MATTEROOM accounting overview with your firm’s documented requirements and confirm the proposed configuration and implementation scope.
Frequently Asked Questions
Can a firm migrate from Tabs3 to MATTEROOM?
MATTEROOM's Enterprise offering lists data migration service, but the exact Tabs3 migration scope should be established through discovery and technical validation.
Is Tabs3 desktop-only?
The source says no blanket claim should be made because Tabs3 publicly markets Tabs3 Cloud.
What should be reconciled?
Time, expenses, WIP, bills, A/R, cash, trust, GL, and required reports should be reconciled, with other modules included where in scope.
Should documents be migrated at the same time?
That depends on the target document architecture, data volume, retention needs, and cutover design. Treat documents as a separate workstream with its own validation.
How can firms reduce migration risk?
Use discovery, approved mapping, trial conversion, exception management, reconciliation, role-based UAT, explicit cutover criteria, rollback planning, and post-go-live stabilization.
Discuss Your Migration Scope
Bring your data inventory, reconciliation requirements, and cutover questions to a discussion of the proposed MATTEROOM configuration.