1. Ask your network administrator or local Helpdesk to see whether your account has Outlook Web App enabled. If Outlook Web App is enabled, ask the administrator or Helpdesk for the address (URL) of Outlook Web App. Usually, the address is in the following form:
https://<Domain Name>/OWA
Normally, you can find the Outlook Web App URL by clicking File->Info in Outlook.
Note This feature is available on Outlook 2010 and Outlook 2013. It depends on the server side settings.
2. Open a web browser such as Internet Explorer, type the Outlook Web App address in the address bar, and then press Enter.
3. If you receive the following certificate warning page, click Continue to this website (not recommended) to continue to open Outlook Web App.
4. On the Outlook Web App sign-in page, type your user name and password, and then click Sign in. The user name must be in one of the following formats:
Username@domain.com
Domain/username
You need of any our Technical Support agent. Please call Technical Support team at +44 203 880 7918 our experts are available 24/7 by phone.
More Info - http://outlooktech.supportphone-number.co.uk/