How to Update an Email Distribution Group - Office365 / Exchange Online

Below are two sets of instructions for updating distribution groups:

Outlook for Windows:

• Click on Address Book -> Choose More Columns. Under Address Book choose Global Address List from the dropdown menu IF this is a new list (instead of Offline Global Address List)
• Search for the name of the list then double click on it. Click Modify Members and add/remove people as needed. Click OK when finished.

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Outlook Web App (if you aren't using Outlook for Windows)

• Login to https://outlook.office365.com
• Click on the cog wheel in the upper right hand corner (settings) the Mail at the bottom.
• Click General (on the left) -> Distribution Groups
• On the right hand side under "Distribution groups I own" double click on the name of the group then Members. Add/remove as needed then SAVE.