O365 components for most plans

K1 – DESKLESSPACK

SHAREPOINTDESKLESS
EXCHANGE_S_DESKLESS

K2 – DESKLESSWOFFPACK

SHAREPOINTWAC
SHAREPOINTDESKLESS
EXCHANGE_S_DESKLESS

P1 – LITEPACK

MCOLITE
SHAREPOINTLITE
EXCHANGE_L_STANDARD

E1 – STANDARDPACK

MCOSTANDARD
SHAREPOINTSTANDARD
EXCHANGE_S_STANDARD

E2 – STANDARDWOFFPACK (?)

E3 – ENTERPRISEPACK

OFFICESUBSCRIPTION
MCOSTANDARD
SHAREPOINTWAC
SHAREPOINTENTERPRISE
EXCHANGE_S_ENTERPRISE

E4 – ENTERPRISEWITHSCAL

OFFICESUBSCRIPTION
MCOSTANDARD
SHAREPOINTWAC
SHAREPOINTENTERPRISE
EXCHANGE_S_ENTERPRISE

source: http://blog.c7solutions.com/2011/07/assign-specific-licences-in-office-365.html