Is is possible to delete ALL messages w/o closing account?

i have been using my gmail account to receive copies of
business emails
as a temporary solution for receiving email on my windows
mobile device
-- (only blackberry devices are supported by my employer).

long story short -- gmail archived all 7,000 of the emails i
received
in the past 6 months, i now have a more secure solution to
mobile
email, and i want to delete everything from gmail -- but
would like to
keep the account as a personal address.

Is there any way of deleting the messages without going
through all 70
pages?

I'm guessing the answer is no, but it's so frustrating.

thanks in advance


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