MS Outlook 2007 (which I purchased separately from the complete MS Office Suite) matches Office 2007 perfectly, (as one might expect). There is one feature of Outlook 2003, however, I would have liked 2007 to have kept, which is, with the calendar in 7-day week view, displaying each day as a rectangular block, rather than as a column.
Maybe I have missed a method of selecting this option, but several of my work colleagues, who are more proficient than me in using this version, have also not managed to find the option.
Otherwise I'm quite happy with it.