You may opt into your g.harvard account via the HarvardKey interface: http://g.harvard.edu/extension-school-and-summer-school-faq/extension_opt_in
It is against Harvard University policy to change your account name. While it is technically possible to do so, by changing your account name you risk missing important communication from the University. We can only change the account name in extreme circumstances.
For more information about your Harvard accounts and access, please visit this article on how to prepare to leave Harvard University.
In most cases, you will be able to have the same email address you used before your leave or gap.
It depends. Best practice is to share ownership of the document.
Yes, your @g.harvard account will be suspended after 40-days. We strongly recommend that you transfer any documents or email out of g.harvard if you are leaving the University.