Hi Mark,
Here are the answers to your questions.
1) Yes, Microsoft deletes inactive Hotmail.com and Outlook.com accounts.
Inactive Hotmail accounts will be deleted after 120 days. Yes, if you email an inactive account you will get a bounce message, most likely indicating that the email address no longer exists. Warning! After 365 days it is possible for someone else to register under the old username that was inactive/deleted.
2) No, you can not see the login history for other Hotmail accounts.
3) Read-receipts are not reliable. You can try using a mail program on your computer to send/receive your Hotmail, such as
Windows Live Mail, and configure it to request read receipts. Do not make the assumption that you'll be notified about read emails, or that the lack of a read receipt means you can assume an email was not opened.
to Email Questions!