Windows 7 SP1 has been available since February 2011 but there are still many that haven’t upgraded their OS. Microsoft will now be rolling out the first service pack, as a mandatory part of Windows Updates for users systems. Users who have automatic updates enabled will get the update automatically the minute it is made available.

The update is sized at 1.9GB and may take users quite a bit of time to download especially if you have a slow net connection. If you don’t get the Windows 7 SP1 update today, don’t panic. It will be rolled out in phases to different parts of the world. The update won’t bring a major change to the OS, instead many small and incremental fixes. The update is available at the consumer level of Windows 7 use, and will not affect enterprise-managed PCs. Microsoft also announced it will stop official support for Windows 7 RTM by April 9.

On its official Windows blog Microsoft says: This update only applies to Windows 7 consumer PCs that are not managed by a Microsoft management tool such as Systems Center Configuration Manager (SCCM) or WSUS Server. SCCM and WSUS administrators still have full control over the release of Service Pack 1. This remains unchanged.”