Your company has an on-premise deployment of Microsoft Exchange Server 2003. Users access their mailboxes by using RPC over HTTP and Exchange ActiveSync. You purchase an Office 365 subscription. From the Office 365 Portal, you create and verify the accepted domain of the company. From the Exchange
Control Panel, you attempt to migrate the mailboxes to Microsoft Exchange Online. An error message indicates that the remote server is unavailable. You need to identify the problem. Which tool should you use?

A. Microsoft Remote Connectivity Analyzer
B. Office 365 Deployment Readiness Tool
C. Microsoft Online Services Directory Synchronization Configuration Wizard
D. Exchange Server Deployment Assistant

Correct Answer: A