Help - Employer deleted /hacked emails

Really need some help. I was suspended from work and accused of not doing my job properly so I forwarded emails from my works email to my Hotmail acct for evidence to show this was untrue. About a week after I sent the emails, they disappeared from my inbox and were replaced by empty emails in my drafts folder. All content had been deleted. I want to know how they have done this? Can I request my Hotmail history from Microsoft to prove this. Don't know what to do. ☹️