Colin Powell used a private email account (not server) only for things that the State Department didn't have a functional email server for. Hillary Clinton avoided using the State Department's perfectly functional system.
Colin Powell only used it for unclassified communications. Hillary Clinton used her email server to receive and send up to TOP SECRET communications.
Colin Powell did not hire personal staff to the State Department basically for the purposes of supporting his private email account. Hillary Clinton brought one of her techs to State so he could more easily support her email server.
Colin Powell did not affirmatively choose to delete emails were under both subpoena in private lawsuits and Congressional investigation. Hillary Clinton did.
Colin Powell did not put his name on a memo that reminded State Department staff of the department policy to avoid using personal email if at all possible, because no such policy existed at the time. Hillary Clinton did put her name to such a memo, because the policy existed before she took office there.
Colin Powell did not have staff who needed immunity agreements from the Department of Justice. Hillary Clinton did, even for things that should not need such agreements, like producing a laptop.
Colin Powell was not represented by lawyers who had conflicts of interest by being potential subjects of investigation over email misuse. Hillary Clinton was -- in fact, one of her lawyers got an immunity deal while representing Clinton.
You have been led around by the nose. Stop being such a tool.
Unsurprisingly, the Republican National Committee operated an email server for White House staff to use for partisan communications and purposes. Unsurprisingly, it's illegal to use federal property for purposes like that. Unsurprisingly, there's no federal law that requires the RNC to retain its internal communications indefinitely, like there is for federal records.