Office365 & Outlook 2010 - Delete Large number of emails

We use Office356 hosted email and our users have the Outlook 2010 client on their workstations.  I have a user that has in excess of 17,000+ emails in her inbox and we need to delete a large number of these emails by date range.  What would be the best way to approach this mass deletion?  Should she log into the web interface to delete or through the Outlook client?  Any help is appreciated.  Thank you.
mmj1Asked:
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Vasil Michev (MVP)Commented:
It will be easier to filter and select the messages in Outlook, although the 'responsiveness' of OWA will be better overall. You can also do this 'server' side by running the Search-Mailbox cmdlet with the -DeleteContent parameter. Or use some sort of EWS based script to do the deletion.

If you need this for a single mailbox, do it from Outlook/OWA I guess.

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mmj1Author Commented:
Thanks for your suggestions.
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