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To backup emails, I suggest you configure the Office 365 account in Outlook and then export the emails to .pst files. Currently, emails cannot be exported from Outlook Web App. For more information, you may refer to the article: http://help.outlook.com/en-us/140/cc511379.aspx
For your another question, we can send emails to distribution groups in Outlook Web App. However, I’m not sure what “send email to a Distribution emails to a specific group” means. Could you please provide more detailed information?
Hi Angeline Thomas,
Please refer to the below given fourm for back up emails in Exchange:
Do you need other help with this issue?