Recently we've made a minor update to our MAILCast service that lets you use the new Office 2007 file formats for your mailing source data.

Now, you can upload files in .xlsx (Excel) or .accdb (Access) format when you need to update the source of mailing data for your channel. These formats join the classic .xls and .mdb file formats that we supported and that you can keep using if you will.

Hope this helps!