I have hotmail.com online account.
I have accidentally deleted (permanently) my important emails 1 Year ago but I need them now so I tried to recover them but failed.
Is there any solution or possible way of recovering them?
They might be recoverable, but I sincerely doubt it, simply because of how long ago you deleted them.
According to Guiding Tech, the only way that you might get these back is by:
If they come back, great. If not, then they truly are gone forever.
The Guiding Tech article also has information about a setting which allows you to recover deleted messages at all. If it's in the more secure setting then there will be no way to restore those deleted messages, but you can at least ease up the setting so you'll be able to do it in the future.