There are some functions that are not supported or technically possible using certain client types. To make an informed choice of how to access the service please see a breakdown of availability and features for a particular client of the service. We realise how you access a mail service is a personal choice and we do not wish to control this, however we cannot support every method available. However functionality such as these and others which are beyond traditional email is not always possible or available with some email clients.
It also offers, for example, the ability to access a personal calendar or access a team mailbox. The service offers more than just personal email.