I had a great question in class today, "What services are installed and used for the CAS and the Hub roles?" So, having a few moments, I went ahead and installed each, individually to find the following:

Client Access Server

• Microsoft Exchange Active Directory Topology Service - Started, Automatic
• Microsoft Exchange File Distribution - Started, Automatic
• Microsoft Exchange IMAP4 - Stopped, Manual
• Microsoft Exchange Monitoring - Stopped, Manual
• Microsoft Exchange POP3 - Stopped, Manual
• Microsoft Exchange Service Host - Started, Automatic

Of course, the CAS will also require installation of IIS and the related services and other pre-reqs.

Hub Transport

• Microsoft Exchange Active Directory Topology Service - Started, Automatic
• Microsoft Exchange Anti-spam Update - Started, Automatic
• Microsoft Exchange EdgeSync - Started, Automatic
• Microsoft Exchange Monitoring - Stopped, Manual
• Microsoft Exchange Transport - Started, Automatic
• Microsoft Exchange Transport Log Search - Started, Automatic

Just as with the CAS, there are also required pre-reqs for the Hub.

Mailbox

• Microsoft Exchange Active Directory Topology Service - Started, Automatic
• Microsoft Exchange Information Store  - Started, Automatic
• Microsoft Exchange Mail Submission  - Started, Automatic
• Microsoft Exchange Mailbox Assistants  - Started, Automatic
• Microsoft Exchange Monitoring - Stopped, Manual
• Microsoft Exchange Replication Service - Started, Automatic
• Microsoft Exchange Search Indexer - Started, Automatic
• Microsoft Exchange Service Host  - Started, Automatic
• Microsoft Exchange System Attendent  - Started, Automatic
• Microsoft Exchange Transport Log Search  - Started, Automatic
• Microsoft Search (Exchange)  - Started, Automatic

Just as with the other roles, there are also required pre-reqs for the Mailbox role.