Thanks to both Palmetto and darkstate01. Fortunately, do have a backup and can reinstall Outlook 07, even though I'd still consider that an unreasonable demand on my time to have to do just to counter Microsoft's abusive marketing. Had not really thought about the backup, because I was so focused on my irritation at Microsoft. However, if I do either of those and Microsoft Customer Services is correct that Outlook 2010 files are not backward compatible with 2007 version, then still in a situation in which all activity is lost from the time since the install of the Office Pro trial. None of this is a data disaster for me or the family. Was just commenting on my perspective regarding anything free from Microsoft relative to its market and customer abuse for its primary products.