Office 2007 hotfix that improves presence, IM and UM integration (And Search)

In the release notes for Office Communicator 2007 there's a reference to a Hotfix for Outlook 2o07 that also may be of interest to Live Communications Server 2005 users (A.k.a. legacy users ;-).
It provides "Consistency of presence data between the presence provider application and Office and improvement of other integration points, including voice mail".

Following are the fixes for presence and IM -

• The presence information that is provided by a presence application is now accurate in all scenarios.
• Instant messaging to distribution lists is no longer supported in Microsoft Outlook.
• The presence icon does not flicker when many people appear at the same time.
• Presence requests from Office applications to presence applications are now handled correctly in all scenarios. For example, a Microsoft Office SharePoint Server 2007 Web page now shows current presence information.
• The icons that are used to display presence data are modified. Users who are red-green colorblind can now determine the status of other users.
  

Furthermore it fixes the following Outlook features -

• In Outlook Search folders, the count for unread items that are hidden is now accurate.
• When you start an Outlook Search folder from a separate application programmatically, the operation now works as expected.
• You do not have to start Microsoft Office Outlook 2007 to discover a server that is running Microsoft Exchange Server. Outlook 2007 now provides an API to discover Exchange Server servers.

It's a 35 MB download and contains updates to a lot of files including scanpst and update to the API to discover Exchange servers. Find KB936864 here that includes link to the download site.