Here are some of the helpful guided walkthroughs for Microsoft Exchange Server, Office 365 and for Lync Server, Exchange Server
Outlook Connectivity Guided Walkthrough – Troubleshooter
http://aka.ms/outlookgwt
Troubleshoot ActiveSync with Exchange Server
http://aka.ms/easgwt
Exchange Server 2010 Datacenter Switchover
http://aka.ms/2010DatacenterSwitchovergwt
Troubleshoot Public Folder Replication for Exchange Server 2003
http://aka.ms/2003pfgwt
Exchange Online / Office 365
Mail Flow Guided Walkthrough for Office 365 – Troubleshooter
http://aka.ms/FixEmail
Office 365 Outlook Connectivity Guided Walkthrough – Troubleshooter
http://aka.ms/outlookconnectivity
Setting up a mailbox that multiple users can access and use
http://aka.ms/sharedgwt
Sending email from another person’s mailbox or from a group in Office 365 Guided Walkthrough
http://aka.ms/sendasgwt
Accessing other people’s mailboxes in Office 365 Guided Walkthrough
http://aka.ms/mailboxaccessgwt
Creating and managing resource mailboxes (conference rooms/equipment) in Office 365
http://aka.ms/resourcegwt
Sharing calendar and contacts in Office 365 Guided Walkthrough
http://aka.ms/sharedfoldersgwt
Hybrid Migration Troubleshooter
http://aka.ms/hybridmigrationgwt
Hybrid Environment Free/busy Troubleshooter
http://aka.ms/o365freebusygwt
Lync Online
Set up Lync Online external communications
http://aka.ms/lyncgwt1
Troubleshooting Lync Online sign-in for admins
http://aka.ms/LyncSignIn
Troubleshooting Lync Online sign-in for users
http://aka.ms/lyncsigninusers