Outlook for Office365 1.1.1.0
Outlook Web Application as a dedicated application. This hosts mail.office365.com and is suitable for using with enterprise work or school environments
Tom Laird-McConnell software
DlSoftware247 lists 2 Windows programs by Tom Laird-McConnell, mostly Client Communication software. The most popular are Outlook for Office365, Outlook for Outlook.com.
Outlook for Outlook.com 1.1.1.0
Outlook Web Application as a dedicated application. This hosts outlook.com and is suitable for using for personal email.