Some have noticed that Outlook 2007 runs a little slower than the 2003 version did. Those of us that have massive amounts of e-mail and calendar data just chalked it up to the amount of data we’re making it crunch. However, it seems that 2007 is actually running slower than 2003 as stated by a recent, yet unpromoted, Outlook 2007 update released this past April 13th.
“This update fixes a problem in which a calendar item that is marked as private is opened if it is found by using the Search Desktop feature. The update also fixes performance issues that occur when you work with items in a large .pst file or .ost file.”
Believe it or not, the difference post update is noticeable.