i've managed to update my phone book by :
exporting to csv file (all fields) using pcsync
open new excel file
import external data (under menu "data") and select the csv file you exported using pcsync
select "delimited" as data type in the screen (this is step 1 of 3 in the import process) press next
select "comma" as delimiter (step 2 of 3) press next
in step 3
click on the header of each column and change the "column data format" to text (this is needed so that excel does not truncate the zeros in the begining of numbers) press finish
excel should ask you "where do you want to put this data?" just press OK
enjoy
