---
title: "MS O365 Admin - Settings"
slug: "ms-o365-admin-settings"
tags: ["calltower", "public"]
updated: 2026-09-18T15:35:41Z
published: 2026-09-18T15:35:41Z
canonical: "learn.calltower.com/ms-o365-admin-settings"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://learn.calltower.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MS O365 Admin - Settings

## Environment

O365 and Hosted Lync or Skype for Business

## Resolution

Disable Lync Online in Office 365 Admin Portal at:

1. Remove Lync Online from the Domain Purpose (do this for every domain):
  - In Office365 Admin Center, click on Domains in the navigation pane on the left.
  - Click on the domain to select it.
  - Click the Manage DNS link on the right side of the screen.
  - Click on the Change Domain Purpose link in the Domain Purpose section.
  - Unselect Lync Online or Skype for Business for instant messaging and online meetings
  - Click Save.

1. Disable Lync Online License for each user (do this for every user):
  - In Office365 Admin Center, click on Users in the navigation pane on the left and then select Active Users.
  - Click on the user to edit it.
  - Click on Licenses.
  - Expand the License Type assigned to the user (ie E3 or E4) to display the list of sublicenses available in that plan.
  - Unselect Lync Online Plan 1 or Plan 2/ Skype for Business Online Plan 1 or Plan 2
  - Click Save.