Delete Messages In a 365 Mailbox Older than X date

Trying the following:

get-mailbox -identity "user@domain.com" -resultsize "unlimited" | search-mailbox -SearchQuery "Received:<$(7/10/2013')" -deletecontent

and

Search-Mailbox -Identity "End User" -SearchQuery "Received:<$('07/10/2015')" -DeleteContent

The search kicks off - 0 results, 0 items deleted.


RunspaceId       :
Identity         : End User
TargetMailbox    :
Success          : True
TargetFolder     :
ResultItemsCount : 0
ResultItemsSize  : 0 B (0 bytes)

This end user has a TON of messages but they need everything deleted before 7/10/15....what am I missing?

Thanks
CoreTechsAsked:
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Vasil Michev (MVP)Commented:
Why the $? Try this:

Search-Mailbox -Identity blabla -SearchQuery "received>=07/10/2015" -EstimateResultOnly

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CoreTechsAuthor Commented:
Thank you
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