Ahh Google settings!
Login at http://mail.sinnimleben.net
Click the Settings link at the top right.
On the Settings TAB, click Forwarding and POP/IMAP.
Make a choice between POP or IMAP and click Save.
Configuration instructions for Outlook are available for each choice.
If you've already done that, the next step would be to check your firewall/anti virus/other security-style programs settings. Make sure nothing is blocking Outlook specifically. Newer programs have a tendancy to offer individual settings for particular programs, so while ping might work, Thunderbird might sit idle, for example.
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