You can let people add Lync or Skype users outside your organization to their list of Lync contacts. Go to Admin > Lync > Organization > External communications.
Tip For a customized list of setup tasks, see Guided walkthrough: Set up Lync Online external communications.
Settings for On except for blocked domains:
Settings for On only for allowed domains:
- You may have to wait for up to 24 hours before the settings take effect.
- Connectivity with instant messaging providers other than Skype is not available.
Set up communication with external Lync users
- Verify your Domain Name Server (DNS) settings for external communications.
- Sign in to Office 365 and go to Admin > Lync > Organization > External communications.
- Under External access, choose On except for blocked domains
Choose On only for allowed domains, and then add the name of the organization you want to communicate with under Blocked or allowed domains.
Keep in mind:
- The organization you’re communicating with must also allow communication with your domain. If the other organization has Lync Server on premises, refer them to the TechNet article Configuring Federation Support for a Lync Online Customer.
- When you’re communicating with someone in a federated domain, you can only use Lync features (for example, video conversations or desktop sharing) that are turned on in both organizations.
Set up communication with Skype users
- If you haven’t already done so, verify your DNS settings for external communications.
- Click Organization > External communications.
- Select the check box under Public IM connectivity, and then click Save.
|Available with Skype* users
||Not available with Skype* users
- Person-to-person instant messaging
- Person-to-person audio calls
- Find and add Lync contacts in Skype
- Video conversations
- IM or audio conversations with three or more people
- Desktop and program sharing
* Skype users signed in with their Microsoft account (formerly Windows Live ID).
Notify your users
Once you’ve set up external communications and verified that it works, let your users know what features are available. You can also direct them to these help topics:
Verify DNS settings for external communications
- Go to the Office 365 admin center and click Domains.
- Select your custom domain name, and then click Troubleshooting.
- If necessary, update your DNS records as appropriate.