About a month away from Windows 10's official launch, Microsoft has launched a new Windows 10 Insider Preview build that aims to fix bugs and increase the level of polish throughout the OS. The new preview version, build 10158, is now available to Insiders on the Fast Ring.

Most of the additions to Windows 10 in this build are fairly minor. Windows 10 build 10158 has ditched Project Spartan branding for their next generation browser in favor of Microsoft Edge, and that brings with it a new app ID and a subsequent loss of existing user data. A number of minor improvements have been made to the browser as well, including the addition of a home button and the ability to import bookmarks from other browsers.

General user experience improvements in build 10158 include updates to Continuum's Tablet mode, new gestures in the Start menu, navigation tweaks, and changes to the way the taskbar notifies users of file transfers and apps seeking attention.

Cortana has received a range of updates in build 10158 as well, including integration into Office 365, flight and parcel tracking support, email sending support (for those with their language set to US English), and the ability to receive notifications about going to and from work.

Microsoft has also updated the Photos app for this build, bringing support for animated GIFs among other improvements. The Snipping Tool has also received minor changes that allow you to add five second delays to your capture.

For those Insiders out there currently in the Fast Ring, Windows 10 Preview build 10158 is now available to download through the usual update process.