<\/span><\/h3>\nIf you want to see duplicates first<\/em>:<\/p>\n\n- In a new column, use:\n
\n=UNIQUE(A:A)<\/code> (Google Sheets \/ Excel 365)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\nThis creates a clean list without changing your original data.<\/p>\n
<\/span>Method C: Case-insensitive cleanup<\/span><\/h3>\nEmails like Test@Email.com<\/code> and test@email.com<\/code> are treated as duplicates in modern tools, but older sheets may not. To fix:<\/p>\n\n- Create helper column:\n
\n=LOWER(A2)<\/code><\/li>\n<\/ul>\n<\/li>\n- Run Remove Duplicates on that column.<\/li>\n<\/ol>\n
\n<\/span>2. Remove Duplicate Contacts in Outlook (2026 versions)<\/span><\/h1>\nModern Outlook versions handle this differently depending on your app:<\/p>\n
<\/span>A. New Outlook \/ Outlook Web<\/span><\/h3>\n\n- Duplicates are often auto-hidden<\/strong><\/li>\n
- You usually don\u2019t need manual cleanup<\/li>\n
- Deleting one contact removes linked duplicates system-wide<\/li>\n<\/ul>\n
<\/span>B. Classic Outlook<\/span><\/h3>\n\n- Open People \/ Contacts<\/strong><\/li>\n
- Sort by email address<\/li>\n
- Look for repeated entries<\/li>\n
- Merge or delete duplicates manually<\/li>\n<\/ol>\n
<\/span>C. Bulk cleanup approach<\/span><\/h3>\n\n- Export contacts \u2192 clean in Excel \u2192 re-import<\/li>\n
- This is still the fastest method for large lists<\/li>\n<\/ul>\n
\n<\/span>3. Remove Duplicate Emails in Gmail Contacts<\/span><\/h1>\n\n- Go to Google Contacts<\/li>\n
- Click Merge & fix<\/strong><\/li>\n
- Google automatically detects duplicates<\/li>\n
- Click Merge all<\/strong><\/li>\n<\/ol>\n
This is fully automated in 2026 versions of Google Contacts.<\/p>\n
\n<\/span>4. Remove Duplicate Emails in Email Marketing Tools (Mailing Lists)<\/span><\/h1>\nMost platforms (Mailchimp, HubSpot, etc.) now:<\/p>\n