Using classic Outlook for Windows in business environments
Hello Temeculamom
Hi, I'm Karl and will be happy to help you today.
That is definitely a legitimate Microsoft email - it is also not specific to Office 365. It has to do with how you are accessing the Hotmail account
#1 - What operating system are you using? If Win7, the problem would be resolved by applying the following
Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows https://support.microsoft.com/en-us/topic/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-winhttp-in-windows-c4bd73d2-31d7-761e-0178-11268bb10392
#2 - What email program are you using on your computer to access this account?
The bottom of the email message you received, contains the following
What if I cannot update/upgrade?
If you cannot update/upgrade your legacy client, we provide an opt-in endpoint for you to continue connecting with TLS 1.0/1.1. Your legacy clients must be configured to pop-legacy.office365.com for POP3 and imap-legacy.office365.com for IMAP4. Using legacy versions of TLS is not as secure as TLS 1.2, however, so we recommend you update and use TLS 1.2.
This isn't anything that would impact your phone
As for "And, is there a phone number or an email address that I can write to", unfortunately the answer is" No. There is no phone or email support for Outlook.com based email accounts (@Outlook @Hotmail @Live @MSN)