In addition to building Exchange, SharePoint, and Lync, the server development teams at Microsoft also offer a good deal of instruction on how to deploy, configure, and troubleshoot those wares, as well as provide handy tools to assist along the way.
Courtesy of the server and tools team at Microsoft, recent additions and improvements to the tool bag include these five gems that aid in Exchange and Office 365 deployment and troubleshooting. They're not only supremely useful, but they're free for the downloading.
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Mail Flow Guided Walkthrough
Mail flow problems are common, whether you're working with on-premise Exchange or Office 365. The Office 365 Mail Flow Guided Walkthrough (GWT) helps narrow down what the problem might be and where to begin troubleshooting. Initially you're asked questions regarding the type of mail flow issue you're having, starting with basic info on the sender and recipient. GWT then presents possible solutions to point you in the right direction.
Remote Connectivity Analyzer
The Remote Connectivity Analyzer (RCA) is an online tool that assists with testing the connectivity, availability, and functionality of your on-premise Exchange (and more recently Lync) environments, as well as Office 365 services. The RCA tool itself is not new, but many of the features are. For example, the Office 365 tab has a feature called Mail Flow Configuration that allows you to verify service delivery, MX records, and outbound connectors. This additional set of tests is geared specifically toward folks using Exchange Online Protection (EOP) for their antispam/antivirus filters between the Internet and on-premise servers.