Updating Active Directory User information

We have around 200 users within AD that I want to update there information
within AD.

I have exported certain fields from AD using the following command.

CSVDE -f users.csv -r "(&(objectCategory=person)(objectClass=user))" -l
"countryCode, description, displayName, comment, manager, company,
department, physicalDeliveryOfficeName, streetAddress, c,
facsimileTelephoneNumber, I, homePhone, mobile, otherTelephone, pager,
postalCode, st, telephoneNumber, co, title, wWWHomePage, postOfficeBox"

I have now updated the information that was exported with excel and saved
the file back to a csv file.

I thought i could just import this back it AD and all the details would be updates. But I seem to be wrong!! Looks like it wont allow me to update users but only creat them.

So my question is: Is there another way I can update the details within AD using the csv I have created.?

Thanks in advance

Karl