I am a Merage MBA alum. How long do I keep my Office 365 mailbox?

Merage MBAs keep their Office 365/Exchange mailboxes for just 3 months post-graduation. They are encouraged by their school to set up Alumni Email Forwarding and not use UCI Gmail post-graduation because most of their graduates tend to stop using their school accounts after a while. To ensure that email sent from the Alumni Association still reaches them, they recommend setting up forwarding.