Yes, it is mandatory to have credentials of admin account if you want to perform the bulk migration of EDB files into Office 365 without much effort.
Yes, the software is completely safe and secure to use. It performs all the operations in the isolated environment without interference from other applications.
Yes, Live Exchange Server is the prerequisite to convert and export it successfully to Office 365.
Yes, the software maintains the exact folder hierarchy before and after the completion of EDB mailbox to Office 365 migration.