If you are receiving errors through the relay service then visit this page

Address book synchronisation allows third party organisations to access NHSmail Directory entries (user details) and copy them into their own internal Microsoft Active Directory (thus making them available to applications such as Microsoft Exchange).

Guidance and technical information on how to federate with NHSmail

Guidance for organisations seeking to federate with NHSmail Calendar

If you are using a mobile device to access your emails, it must first be synchronised with the NHSmail service before you can manage any changes in Outlook Web App.

Abbreviation of all the meanings that are used in NHSmail

Removed functionality of OWA 2013

The guide attached informs you how to view conversations by email as well as how to ignore emails.

The guide will inform you about bulk actions in NHSmail

This guide has all the terminologies that are used in OWA