Hi farmlady777,
Once the free trial expires, you won't be able to continue trialing Office 365. You will have an additional 30 days to purchase Office 365 before your account information is erased. Once the trial account information has been erased, it cannot be retrieved.
The Office 365 system will send the notification email to the email address which you have registered in your profile. Any unknown issue relate to the recipient’s email box would cause the mail missing.
For more detailed information, you can refer to the article below:
http://www.microsoft.com/en-us/office365/faqs.aspx (Q: Will my trial information be transferred to my Office 365 subscription? )
Thanks,
Wilfred Ying