KB233: Leading Zero Dropped in Word/Excel Mail Merge
Related documents: Set a Cell Format as Text in Excel; About Mail Merge for Form Letters and Mass Mailings
If the postal code starts with a 0 (for example
"01234"), Word interprets it as "1234". To work around this behavior, format the
postal code fields as text (rather than as numbers) in Microsoft Excel. Then
postal codes that start with zero will be available in Word.
Microsoft has confirmed that this is a problem.
Method 1: Prior to entering the data:
Method 2: While entering the data: