Many email service providers are offering multiple different email products; e.g., one for consumers and one for business customers. Also, multiple versions of a certain product might co-exist, such as Exchange version 2013 and Exchange version 2019 for business customers.
It is however important to know your actual service, in order to work with your email account - may it be configuration in an email client application or migration.
To find out your actual product, you may look up the product name by logging into the customer portal of your provider. Alternatively, you may get in touch with your provider's support. If you know the Webmail URL or the email account settings used to configure your email client application.