When Exchange 2007 in installed with HUB, CAS and Mailbox server roles.
Services and their default start up modes are listed in the following table.

Service Name Default Startup Mode
Microsoft Exchange Active Directory Topology Automatic
Microsoft Exchange Anti-Spam Update Automatic
Microsoft Exchange EdgeSync Automatic
Microsoft Exchange File Distribution Automatic
Microsoft Exchange IMAP4 Manual
Microsoft Exchange POP3 Manual
Microsoft Exchange Mail Submission Service Automatic
Microsoft Exchange Mailbox Assistants Automatic
Microsoft Exchange Information Store Automatic
Microsoft Exchange Replication Service Automatic
Microsoft Exchange Search Indexer Automatic
Microsoft Exchange Service Host Automatic
Microsoft Exchange System Attendant Automatic
Microsoft Exchange Transport Automatic
Microsoft Exchange Transport Log Search Automatic
Microsoft Search Exchange Manual
Microsoft Search Monitoring Manual