i'm trying to setup a POC for Office365 and am using Office Online. is there a way to hook up Outlook.com to my mailbox in an on-premise Exchange?

Hi,

This forum is for general questions and feedback related to Office desktop client. Since your question is more related to Office 365 and Outlook.com, I'd recommend you post a new question in the following forum for further assistance:

https://community.office365.com/en-us/f

The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.

Steve Fan

Forum Support