These are from MS. I wouldn't be worried about KB837009 as it affects Outlook Express and I don't see anyone using OE on the unity server. As for
KB885250, I would say that it is an important update.
http://www.microsoft.com/technet/security/bulletin/ms04-013.mspx
Summary
Who should read this document: Customers who have Microsoft® Outlook Express® installed
http://www.microsoft.com/technet/security/Bulletin/MS05-011.mspx
Executive Summary:
This update resolves a newly-discovered, privately-reported vulnerability. The vulnerability is documented in the “Vulnerability Details” section of this bulletin.
An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
We recommend that customers apply the update immediately.
