EX2010 SP1 - Deleting a Message using EMS

I'm trying to write an EX2010 SP1 EMS command to delete a message with the following attributes:

Rcv'd between: 3/26/2012 & 3/27/2012
Subject: blah blah
Sent to: specific user

I've tried the following but I get an error:

get-mailbox "user.name" |search-mailbox -searchquery 'subject:"blah blah"
' -StartDate "3/26/2012" -EndDate "3/27/2012" -deletecontent

The error I get:

A positional parameter cannot be found that accepts argument '3/26/2012'.
    + CategoryInfo          : InvalidArgument: (:) [Search-Mailbox], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Search-Mailbox

If I remove the -startdate and -enddate, it's successful, but it searches and deletes all messages with subject 'blah blah', which is not what I need.
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NAMEWITHELD12Asked:
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Jian An LimSolutions ArchitectCommented:
you use -SearchQuery “Subject:Exchange”,”Sent:today”

or -SearchQuery “Subject:Exchange”,”Receive:today”

Or something like that, you can put sent and receive criteria but startdate and enddate is not valid command i believe.

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NAMEWITHELD12Author Commented:
Are there other command variables than just today?  I ask b/c now the message was received on the 27th...
Jian An LimSolutions ArchitectCommented:
i don't have an exchange 2010 with me,

my guess it will take a day.

      

like sent:28/03/2012 (or MM/DD/YY depends on your date format)
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