Clinton knowingly had classified information on a server that was not secured. If you can't understand that, you're either a moron or a hyperpartisan loon.
Clinton's private email server was set up to receive mail from the State Department's UNCLASSIFIED email system. That State Department network was: 1) Not encrypted, 2) Had been hacked multiple times (including during the 1990s when Bush was in office), and 3) Not supposed to have classified information on it in any way.
There actually is a scandal here, but it's not the one morons like you think it is. The scandal is how so much classified information was being put onto the unclassified State Department servers in the first place, long before it got copied to clintonemail.com, and the lax attitude that many State Department employees had in regards to handling such classified information.
So in short, if you want to bash Secretary Clinton for failing to recognize that the Department of State had a serious cultural attitude problem in properly handling classified information, and failing to fix it by directing her staff to find the people who were putting classified information onto the unclassified State Department server system - well, be my guest. That's a fair critique. (Though one, Secretary Powell would also have to cop to, and he was a general, so my assumption is that he should have been more aware of this than Clinton.)
If, on the other hand, you want to act like some sort of typical hyperpartisan loon and try to accuse her of some sort of crime, by making up complete bullshit about the system or her private server, well then I can't exactly stop you - I can only laugh at your idiocy, as common as it is. I understand that we're fully into silly season by now, with basically half the country acting sounding like the Cobert Report's Steven Colbert, except actually being serious about it.