ASKER
Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.
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If you're using POP3 then all your sent items will reside in your mail client - they are not intended to be stored in your server.
Some options:
1). Upgrade to IMAP - it's far superior to POP3.
2) Download your inbox, then clear it in Gmail, move your sent items to the inbox, then download them too. Good in theory, but I haven't ever tried this.
3). Export your Gmail, download it, and extract locally.
Hope that helps,
Alan.