Exporting and Importing for User Details in 7.0 to 7.4

Dear all,

we are recently migrated the Portal component and WDJ component.But know one problem we are facing.Live 7.0 system user's move to  7.4 system.This time we can use export and import.But here missing the user Start date of account validityand End date of account validity.

So tell me how to get the user same information 7.0 to 7.4. Very urgent..?

Please tell me....:

Regards,

Durga Rao.