Is INDEX MATCH obsolete?

No. It remains common in enterprise models and works on older Excel. XLOOKUP is the modern default when available.

Which handles two-way lookups?

Both can. INDEX MATCH separates row and column logic; XLOOKUP can use two XMATCH calls or a single XLOOKUP with wider return arrays.

Performance is similar for most business tables. Avoid full-column references on millions of rows regardless of function.

XLOOKUP vs INDEX MATCH

Compare XLOOKUP and INDEX MATCH for flexible Excel lookups, including readability, compatibility, and two-way matching scenarios.

Use XLOOKUP for most modern lookup tasks. Use INDEX MATCH when maintaining legacy workbooks or when row and column matching are already separated in the model.

XLOOKUP expresses lookup value, lookup array, and return array in one function.
INDEX MATCH requires two functions but remains very flexible in advanced models.

Is INDEX MATCH obsolete? No. It remains common in enterprise models and works on older Excel. XLOOKUP is the modern default when available.
Which handles two-way lookups? Both can. INDEX MATCH separates row and column logic; XLOOKUP can use two XMATCH calls or a single XLOOKUP with wider return arrays.
Which is faster on large data? Performance is similar for most business tables. Avoid full-column references on millions of rows regardless of function.

XLOOKUP: one function, left or right lookup, built-in not-found message — best for new M365 workbooks.
INDEX MATCH: two-step row/column logic — still common in legacy models and two-way intersections.
INDEX MATCH works in older Excel; XLOOKUP needs Excel 2021 or Microsoft 365 desktop.
Neither replaces FILTER when you need all matching rows to spill.

Pilot XLOOKUP on a copy before replacing hundreds of INDEX MATCH pairs in production files.
Keep INDEX MATCH when row and column lookups are maintained by different owners or sheets.
Reconcile results with EXACT on sample keys after any lookup migration.

Build both formulas side-by-side on a sample Table and compare results row by row.
Document which version each stakeholder uses before standardizing on the newer function.
Keep a migration log when replacing legacy formulas — note old and new syntax per column.

Verdict summary: Use XLOOKUP for most modern lookup tasks. Use INDEX MATCH when maintaining legacy workbooks or when row and column matching are already separated in the model.
Recreate both formulas on ten sample rows and compare with EXACT or subtraction helper columns.
List which teammates still run Excel 2019 or Excel for the web before mandating the newer option.
Document migration date and owner when replacing legacy syntax in shared production models.
Related functions to review next: XLOOKUP, INDEX, MATCH, XMATCH.
Keep legacy blocks stable during pilot — migrate one column or report section at a time until totals reconcile.

Publish the verdict internally: Use XLOOKUP for most modern lookup tasks. Use INDEX MATCH when maintaining legacy workbooks or when row and column matching are already separated in the model.
Pilot on a copy of the production sheet with ten known test keys before mass migration.
Train Excel 2019 users on the legacy option until IT confirms Microsoft 365 desktop for all editors.
Add a changelog column documenting which rows still use the older function after partial migration.
Link new hires to both function pages and this comparison from your team wiki or onboarding doc.
Re-run reconciliation monthly for one quarter after rollout to catch edge cases early.