At the top of the page, select New message.
On the To line, enter the name of the group or the group email address.
Add a subject and type your message.
Select Send.
Alternatively, you can do the following:
In the left pane, under Groups, select the group.
At the top of the message list, under the group name, select Send email.
Add a subject and type your message.
Select Send.
Forward an email to an Outlook.com group
When you forward a message that has an attachment, the forwarded message will include the attachment.
In the message list, choose the message that you want to forward.
At the top right corner of the message pane, select , or select and then select Forward.
On the To line, enter the name of the group or the group email address.
Type your message and then select Send.