The Virtual Server 2005 R2 Management pack is refreshed (not an update). The Release and Update History on the download page http://www.microsoft.com/downloads/details.aspx?FamilyID=bf21f798-9b10-40dc-bcdd-4a8358cce94d&DisplayLang=en will show the most recent date 2/19/2007.
Why the refresh? A problem existed, documented in http://support.microsoft.com/kb/919598/en-us,
where the report.xml will fail to import against SQL Server Reporting Services 2005 (SSRS). The refreshed version contains an updated report XML file which will successfully import on SSRS 2000 & 2005.
A secondary issue has also been fixed where the report data sources were not intact after the import.
The version of the MP remains the same (05.0.4000.0000), and there are no updates to the Management Pack AKM file itself.
Another Management pack report discussed in KB919598, the Exchange Server 2000-2003 Management pack, is also refreshed. The Release and Update History on the download page http://www.microsoft.com/downloads/details.aspx?FamilyID=EFDEA5C6-6835-47CB-AF4F-43F3A3E30279&displaylang=en will show the most recent date 3/7/2007.