Hello Guys , Today we will talk about setting up External communication in Lync -Office 365 .
So, we have a scenario like this ” The Users in your Organization want to communicate with users in some other Organization over Lync “
To achieve this follow the below steps :
1. Switch on External communication:
2. Once this is achieved , it is better to wait for 24 hours before performing the next steps .
3. In Lync Admin Center , go to tools and then Set up Lync for External Communication
4.
5. Click , it has been 24 hours
6. 
7.
Now , you are done .
Add the user from one of the Lync client and check if they are able to communicate as shown below:
