Urgent Excel Contact Update

I have an existing customer list saved in a single Excel workbook and need every record brought fully up-to-date. The job is limited to contact information only—specifically the email addresses, phone numbers, and mailing addresses for each customer.

You’ll work directly in the Excel file, correcting outdated details, inserting any missing information, and standardising the formats so that the sheet is clean and ready for immediate use. When you finish, I expect the same workbook returned (XLSX) with all fields complete, no duplicates, and clear formatting throughout.

Speed matters: the list is ready for you right now and I’d like the revised file back as soon as possible. If you have solid experience cleaning data in Excel and can start immediately, this should be a straightforward task.