If you use Microsoft Outlook to receive your emails, then at some stage you will stop receiving them.
But over the next few weeks, because of some changes that Microsoft are making to their email services, you will need to make some changes to your email application in order to continue to read the emails. For most people they will log into the website, or to view those emails but a lot of people use Microsoft Outlook or some other email client to read their emails.
Microsoft runs a number of email accounts, which are very popular.