The limitations of a shared mailbox are quite anoying and sometimes you want to convert the mailbox to a normal mailbox.
It’s quite simple exactly. Follow these three steps:
First set a password that meet the complexity requirements an the shared mailbox.
Second step is to enable the account.
Third step is to use the following Powershell command:
set-mailbox [mailbox name] -type Regular
Thats it. Now your done.