Tool for to migrate webmails to webmails

We need to write an application for a tool that can access an old webmail hosting account and somehow transfer/forward the email to the new webmail hosting account. ## Deliverables Rent A Coder requirements notice: As originally posted, this bid request does not have complete details. Should a dispute arise and this project go into arbitration "as is", the contract's vagueness might cause it to be interpreted against you, even though you were acting in good-faith. So for your protection, if you are interested in this project, please work-out and document the requirements onsite. Let me start off with how the need came about. We are migrating some domains from one hosting provider to another different hosting provider. Problem we are facing is that a lot of our users are using web mail (which means they do not download their mails via POP into a mail client). We therefore need a solution for a tool which can connect to the old webmail hosting account and somehow transfer the emails over to new webmail hosting account. Theoretically, it shouldn't sound difficult because we have access to both the old and new webmail accounts. How the emails will look like in the new webmail server in terms of who is the sender, I am unsure. Ideally, it should look like an orginal message and not as a forwarded message. We will need source codes and detailed description on how to use. If the tool can do multiple webmail accounts migration simultaneously, it will be a bonus. ## Platform The tool should be easily installed or run on any windows platform.