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(Screenshot by Zack Whittaker/ZDNet US)
Gmail: deleting old email for good
In Gmail, it is extremely easy. Simply run through and delete all of your email messages as you normally would, by clicking Send to Trash.
Once you are in the Trash folder, hit the Empty Trash Now button and hit OK. All messages will be non-recoverable from this point.
(Credit: Zack Whittaker/ZDNet US)
Uninstalling Outlook 2010
That's it! We're done transferring email around. Now we just need to uninstall Outlook.
Find your Programs and Features centre (in the Control Panel) and scroll down to Microsoft Office Home and Business 2010.
If you already have it installed (even before this guide), then hit Change and remove Outlook in the next steps.
If you want to remove Microsoft Office Home and Business 2010 completely, hit Uninstall.
Via ZDNet US