Decent Software for Managing Multiple E-mail Accounts???

I've got about 7 e-mail accounts, and logging in and out of them constantly is a pain sometimes...

I was curious what good programs you guys would recommend for Windows 7 Home Premium users to make it so that all 7 of the e-mails can be accessed at once through a program or something.

Preferably one that I can manage easily.

Bonus: A "lock" on certain features of the e-mail accounts would be nice.

IE: I have a business e-mail and then I have a personal e-mail.
I'd prefer people don't read my personal e-mails, but I'd like it on the program so it's easier for me to access... So if there's a way to make it so they can't read it at the time would be nice.

Thanks for any and all help guys.

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