On October 10, 2017, Office 2007 will reach End of Life. If you haven't already begun to upgrade your Office 2007 environment, we recommend you start now.
When Office 2007 reaches its End of Life on October 10, 2017, Microsoft will no longer provide:
Technical support for issues
Bug fixes for issues that are discovered
Security fixes for vulnerabilities that are discovered
In addition, as of October 31, 2017, Outlook 2007 will be unable to connect to Office 365 mailboxes, which means Outlook 2007 clients using Office 365 will not be able to receive and send mail.
Full Microsoft document: https://support.offi...7a-6a9b14ef2745