A company has an Office 365 tenant and uses Exchange Online and Skype for Business Online.
User1 is scheduling a Skype meeting with User2. User 1 is not able to see availability information for User2.
You need to troubleshoot the issue.
What should you use? information of an on-premises mailbox, and vice versa analyzer-mca-1-0-and-microsoft-remote-connectivity-analyzer-rca-2-1/

A.
Microsoft Connectivity Analyzer Tool

B.
Microsoft Lync Connectivity Analyzer Tool

C.
Message Header Anslyzer

D.
IdFix

Explanation:

The Microsoft Connectivity Analyzer Tool verifies that an Office 365 mailbox can access the free/busy
References: https://blogs.technet.microsoft.com/exchange/2013/03/11/announcing-microsoft-connectivity-