Log in to your Outlook.com or Office365.com email client for the account that matches your Groove mailbox address. If your mailbox address is firstname.lastname@example.org, you should be logged in as that user in Outlook.com or Office365.
Click the gear icon in the top, right corner of the page and select More mail settings from the drop down menu.
On the options page, select on Email forwarding.
Select Forward your mail to another email account, and paste your Groove forwarding address into the text box below.
We recommend checking the box to Keep a copy of forwarded messages in your Outlook inbox for backup purposes, just in case :)
Just Save and you're all set! You're ready to start forward messages into Groove!
Please note: You can also create a global user in the admin panel, then create a distribution list including this contact on for your support@ address.