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You can also view the mailbox via a web browser. When you send a message in OWA in comes "from" the mailbox you are viewing.
Option 1:
https://outlook.office365.com/owa/utexas.edu/<mailbox email address>
For example:
https://outlook.office365.com/owa/utexas.edu/ecac@engr.utexas.edu/
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When you send a message in OWA in comes "from" the mailbox you are viewing.
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Option 2:
- Log into your own mailbox, https://outlook.office365.com.
- Once logged in, choose your initials in the top right corner and select "Open another mailbox"
- In the search box, enter the display name or the email address of the mailbox
- When the mailbox is found, select it and select "open".