The Importing users [not sure if thats what you are doing] updates existing users with new information.
So if I an existing User of
Email,Name,Phone,Notes
jdoe@domain.tld,Jane Doe,1012023434X1111,test
and import
Email,Name,Phone,Notes
jdoe@domain.tld,John Doe,90980876476X9999,test
Jane Doe will no longer exist, and will become John Doe. Their phone and extension will also be updated.
heart1010 Should it be possible to import/add an email in the database which starts with a blank space
Probably not.