Hillary Clinton used her personal email for work

You couldn't be any further from the actual issue.

• She used a private server, to intentionally skirt FOIA/government regulations
• Her private server was completely insecure
• She transmitted classified, top secret, AND SAP LEVEL INFORMATION. SAP is "Special Access Programs". Need-to-know. Only accessible for a handful of people. and She had it on her private, unsecured server.
  
• There were multiple attempts by foreign nationals to breach her server, and the FBI itself said they'd have no way of knowing if those attempts were successful or not because of the nature of the server and it's security system.

This list could go on 20x longer, but if you think the issue is that she just used a personal email to write some work emails you have not spent any time looking into it.