The Microsoft Office Outlook February Cumulative Update (CU) contains a large set of the fixes that release as part of the 2007 Microsoft Office suite Service Pack 2 (SP2).
Outlook 2007 SP2 delivers performance improvements in four major areas:
- General Responsiveness
SP2 reduces I/O disk usage and UI response time.
SP2 removes long operations from initial startup.
SP2 makes Outlook exit predictably despite pending activities.
- Folder/View Switch
SP2 improves view rendering and folder switching.
Frequently Asked Questions about the February CU and Announcing the February Cumulative Update for Outlook 2007 as well as this article Outlook 2007 improvements in the February 2009 cumulative update
Last word of warning. I have run into some glitches after applying this update with incomplete search results with blank rows at the bottom as well as duplicated rows in the result. But other than that Outlook is indeed quicker and snappier. Now if they just could make search better and quicker.