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Mass User Migration to access customer portal



I not quite sure if this post gets in here!

we have a Customer portal site (Not sites) and around 25,000 users.we have now built sites and want to use this as our future customer portal site.We now want to migrate all those 25,000 users to salesforce.


What i am curious to know is, how do i send them a new password after migrated to salesforce?

I know that we can use Data Loader and create New Users.But through UI we can create a View and use reset Password(s).But this approach too would not display all 25,000 at a time.I want to know if at all there is any other way we could accomplish this.

Any help on this is highly appreciated.





Best Answer chosen by Admin (Salesforce Developers) 

you can use salesforce API to create users and reset their passwords