As Hotmail is a free web mail service, it's not surprising.
If you accidentally delete a message, you typically have only 1 or 2 day to recover it in it's totality.
After that time, any attachment, then the body of deleted messages are automatically suppressed to free up server space.
This apply to all free web based mail accounts.
If you have a paid web mail, you may have over a month, or until you empty your trash/deleted mail folder.
Electro
June 2016