Powershell script/snippet to count/subtotal Exchange 2003 mail messages by message class

Does anyone know how to use Powershell to count and/or subtotal how many messages of a certain message class are in a given Exchange 2003 mailbox ?

For example, given a mailbox, how many IPM.Note or IPM.Note.SMIME.Multipartsigned or IPM.Schedule.Meeting.Request messages are there.

The solution does not have to subtotal multiple random values, just show how to query a mailbox for a count of a given message class or explain an alternate way of doing it or even reasons against doing it.

Thanks!

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