Microsoft on Tuesday released its April package of secrity updates for Windows. The updates include patches for five security vulnerabilites that Microsoft had rated ‘critical,’ its highest security flaw rating. Microsoft also released patches for their AntiSpyware tool as well as fixes for Exchange Server 2003 and Office 2003. All fixes are available from their usual locations; Windows fixes from Windows Update, office fixes from Office Update.

In related news, Microsoft also disabled a utility that allowed businesses to delay the rollout of Windows XP Service Pack 2 via Microsoft’s Automatic Updates feature. The utility was designed to give mid-to-large enterprises time to test SP2 on their systems before rolling it out across their wider networks.