I have no access to a PC running Office 2007. My PC is running Office 2010. I must send files to a user that only has access to 2007. The end user does not have admin rights on her PC so there is no way for her to install any compatibility pack, upgrades, etc.

I must be sure that the files I create in Office 2010 can be used by the user with Office 2007. In the past, Office had the ability to save files in previous formats. In the dropdown box now, however, there is a provision for versions of Office prior to 2007 but there is no provision for 2007.

How can I be certain that the file is in 2007 format?

Saving in a previous format, like Office 2000, is not an option. The file must look native to the Office 2007 user.

Thanks!