There are different options depending on your relationship with the university:
Ongoing e-mail forwarding from your @umich.edu e-mail address is provided at no charge. See Forwarding or Redirecting Your E-Mail Using the U-M Online Directory Via the Web (S4279) for details.
If you wish to continue using the standard computing services, you can sign up for U-M Online.
Emeritus/Emerita faculty may continue using standard computing services at no charge. For details, see 19.K Emeritus/Emerita Status in the U-M Faculty Handbook.
Retired staff members retain their ITS-provided e-mail mailbox, but do not receive other standard computing services, such as IFS space. See Frequently Asked Questions About ITS Services for U-M Staff Retirees for details. To continue receiving all standard computing services, retirees may sign up for U-M Online.
Faculty and staff who leave the university for reasons other than retirement are not eligible to continue using standard computing services.