I'm currently working for a company that had an inefficient setup for their "department" mailboxes (i.e. mailboxes like email@example.com, firstname.lastname@example.org, etc). I quickly realised that I can save the company a lot of money by simply using our Office 365 Exchange server's shared mailboxes for them and giving the relevant employees access to them. Basically, they used
The problem is, we're currently using GoDaddy (and the Exchange server that came with our domain and Office products) and if I wanted to remove the Office 365 license I'd have to delete the entire account, including the mailbox. I've been searching online for a solution that could quickly migrate a large quantity of user mailboxes to identically-named shared mailboxes, or at least make some sort of provisional temporary mailbox to move the mail there, delete the account and then remake it as a shared mailbox.
This would be extremely tedious to do one by one, there's currently around 40 department Office-licensed mailboxes, and with Exchange's slow speed it would take quite long to do. Is there any solution to simply "replace" a user mailbox with a shared one in Exchange so I can then kill the license in GoDaddy and retain data? Or does this need to be done by backing up the mails to alternative mailboxes, and then renaming them to the "correct" names?