I am building a string of unique codes that can exceed 256 characters. When
it does and I view the data in a pivot table, it truncates to 256. Is there
any simple way do deal with this? I thought Office 2007 increased this
limitation.

I am using this string to identify unique configurations, each defined by
the string of order codes on the invoice. I am then using the pivot table to
count the number of occurances of each unique configuration.