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Fix VBA ‘Subscript out of range’ errors in arrays. Bounds-checking, dynamic array sizing, and the LBound/UBound safety pattern.

Fix Excel ‘Digital signature is invalid’ errors. Certificate expiration, the re-sign procedure, and Trust Center signature settings.

Fix Excel AND/OR functions returning unexpected TRUE. Operator precedence, short-circuit evaluation, and the parenthesization rules for complex conditions.

Resolve Excel VBA Automation Errors when controlling Outlook. Object lifetime, security prompts, the late-binding fix, and Outlook security prompt suppression.

Fix VBA ‘Cannot access file’ errors during SaveAs operations. Path validation, lock detection, and the safe-save procedure preserving original files.

Fix VBA ‘Invalid use of Null’ errors with database-linked sheets. NULL detection, type-safe coercion, and the IsNull guard pattern.

Master Excel SEARCH vs FIND case-sensitivity. The unique behaviors, when to use which, and the EXACT alternative for case-strict matching.

Fix VBA project password issues. Lockout recovery, file structure modification, and the difference between VBA and workbook protection.

Resolve VBA broken-path errors when macros call external files. Path validation, network share testing, and the relative-path pattern that survives moves.

Fix VBA ‘Ambiguous Name Detected’ compile errors. Duplicate procedure names, module scoping, and the renaming strategy for project organization.