This time they look like they're from Microsoft:
QuoteUpdate for Microsoft Outlook / Outlook Express (KB910721)
Brief Description
Microsoft has released an update for Microsoft Outlook / Outlook Express. This update is critical and provides you with the latest version of the Microsoft Outlook / Outlook Express and offers the highest level of security and stability.
Instructions
To install Update for Microsoft Outlook / Outlook Express (KB910721) please visit Microsoft Update Center:
LINK REMOVED!
Quick Details
File Name: officexp-KB910721-FullFile-ENU.exe
Version: 1.4
Date Published: Tue, 4 Aug 2009 18:41:07 -0500
Language: English
File Size: 81 KB
System Requirements
Supported Operating Systems: Windows 2000; Windows 98; Windows ME; Windows NT; Windows Server 2003; Windows XP; Windows Vista
This update applies to the following product: Microsoft Outlook / Outlook Express
I only started receiving these yesterday, but I thought I'd better mention it.Unsurprisingly I'm not receiving them via my hotmail account, but through my website email.