Microsoft has released fresh security updates for Office, and an update to its MSN messenger application.

The MSN Messenger update brings the product to version 4.0.1. The company describes it as "mandatory to ensure that all software accessing the service is using the most robust and current version available."

New security updates for Office 2001 and Office v.X for Mac are designed to patch a flaw recently identified in Excel. Both releases also mend, "several security and stability issues with Word, PowerPoint, Excel and Entourage", the company said.