Exchange 2010 SP1/SP2 – Export mailbox to PST without contacts or other items

Exchange Shell:

Assign Permission:
New-ManagementRoleAssignment -Role "Mailbox Import Export" -User "username"
Logout then log back in.

Run Export Request:
New-MailboxExportRequest -Mailbox username -ExcludeFolders “#Contacts#” -FilePath \\server\share\user.pst

Monitor Status:
Get-MailboxExportRequest | Get-MailboxExportRequestStatistics

Cleanup:
Get-MailboxExportRequest | Remove-MailboxExportRequest

Source: Stevieg

“#Contacts#” can be replaced for excluding other items:
Inbox
SentItems
DeletedItems
Calendar
Contacts
Drafts
Journal
Tasks
Notes
JunkEmail
CommunicationHistory
Voicemail
Fax
Conflicts
SyncIssues
LocalFailures
ServerFailures