On their last day
- Block sign-in for the user.
- Sign them out of all sessions and reset their password.
- Remove or wipe the work data on their phone if they used one for work email.
Keep their email and files
- Give a teammate access to their mailbox, or convert it to a shared mailbox.
- Give a teammate access to their OneDrive files before the account is deleted.
- Set an automatic reply or forwarding so customers aren’t lost.
Afterwards
- Remove the license, or delete the user, once their data is handled.
- Remove them from Teams, groups and SharePoint sites they owned, and make sure each has another owner.
- Record what you did and when.
Menus change. For current click paths, see the official help article.