Microsoft has announced that users will be able to automatically update their Windows 7 operating system to Service Pack 1 (SP1) starting today.

In an official blog posted March 18, Microsoft stated that the installation of the service pack will be fully automatic with no user action required for those who already have the operating system feature called Windows Update enabled.

The plan was part of an "ongoing effort to ensure continued support and improved security updates for customers who have not yet installed SP1," stated the blog post.

SP1 was first released in 2011 but until now had required users to manually install it.

The blog post warned that The SP1 update will take longer than a regular update, that users should be sure they have enough available storage on their PC and that the device is plugged in.

"If the service pack installation is interrupted, it will reattempt to install automatically after the next restart," Microsoft said.

Windows 7 with no service pack will no longer be supported starting April 9, 2013.