Default mail client windows 7

You didn't list which mail client you are trying to use.

That said, windows 7 doesn't come with a mail client. you need to choose one and install it.

I prefer Thunderbird, but there are a lot out there to choose from.

http://www.mozilla.org/en-US/thunderbird/

windows 7 doesn't have a built in email client by default, but if you want a Microsoft version just hit the start icon, type essentials, hit enter. You can choose to download windows live mail from this package.

Or you can just use this link --> http://explore.live.com/windows-live-essentials-other-p...

That is the one single thing I hate about Win7, Outlook express was just so easy and worked great. Live is such a bloated resource hogging piece of crap.

Several option:
1) probably the best - select a 3rd party email client such as Firefox or thunderbird as mentioned by Hawkeye 22

2) use microsoft windows live - Yuk

3) Most expensive (unless you have), Use outlook (NOT Outlook express). Comes with the Microsoft Office Suite - Not home version but more expensive version) Had a company supplied copy so that is what I'm using.

4) Most dificault, but doable. Copy over Vista winmail. This is what I did for wife's computer as she hates Change, and liked vista win mail (updated version of outlook express). This requires the use of a computer that has Vista still on it and knowledge of changing the "Privilege" attribute.
Can goole using "vista win mail in windows 7.