Free Space in Exchange

A formula for calculating how much space is left before Exchange 2000/2003 (Standard) shuts down. Next step is to script all this and have the results emailed.

Space left before shutdown = MAXDBSIZE - (PRIV1.EDB + PRIV1.STM) + FSDB

Where:
MAXDBSIZE is 16 GB for Exchange Standard version, 75GB for Exchange 2003 SP2
PRIV1.EDB is the physical size of the database file
PRIV1.STM is the physical size of the database file
FSDB is the value listed in the Event ID 1221 for the Private Information Store