Why does Outlook 2010 still leave e-mails on my e-mail server???

Hello. I have a question regarding Microsoft Office 2010's Outlook program. I have been using Office 2007 for the past few years and now I have Office 2010. Both my Office 2007 and 2010 versions have Outlook 2007 and 2010 respectfully. I just installed Office 2010 and setup my e-mail accounts in Outlook 2010. While setting up e-mail accounts, I used the same process as I did when I setup e-mail accounts in Outlook 2007 -- they are essentially the same manner and method to setup in both Outlook versions -- nothing different. Now, after I setup my Outlook 2010 and downloaded my e-mails into Outlook 2010 from my e-mail server , I rechecked my webmail account online. I was surprised to find that the same e-mail messages were STILL ON my e-mail server AFTER I downloaded them to Outlook 2010. I then uninstalled my Office 2010 and consequently Outlook 2010 and reinstalled Office 2007 with Outlook 2007. After I setup my Outlook 2007's e-mail accounts, I downloaded the e-mails from my e-mail server as well AS I KNEW they were STILL ON their e-mail server. I went back into my online webmail account, and this time, there were NO messages left on it. I have known this to be the case with Outlook 2007 from the past.

My preference or desire? To leave NO messages on my e-mail server when they are downloaded to Outlook 2007 AND Outlook 2010. ...but I did NOT do ANYTHING DIFFERENT between Outlook 2007 and 2010?!?!? So what is going on???????

If anyone knows why Outlook 2010 leaves the messages on my e-mail server after downloading and Outlook 2007 does not, please share with my why... ...and what I need to do with Outlook 2010 to make the modifications or changes necessary NOT to leave messages on my e-mail companies server? The account type is POP3.

Please reply.
Thank you!

 

@ DavidGP:

Hello. Thanks for your reply. Yes, I just found out from a friend that the default option was changed in Microsoft Outlook 2010. I guess it was based on user feedback and the desire for e-mail servers to KEEP the e-mails instead.

Actually, I'm finding that Outlook 2010 is much different than Outlook 2007 -- not just the new ribbon. For example, in the navigation plane, instead of showing "Personal Folders" and the "All Mail Items" mail types; it shows the mail item types on top and the e-mail accounts you have setup with Outlook 2010. It appears "Personal Folders" is gone in Outlook 2010.