Microsoft may be readying not one but two OS updates today. Recently, we reported that build 10586.71 was being prepped for release today and over the weekend some eagle-eyed people even spotted it on Microsoft's servers.

Now, we hear that build 10586.75 may be pushed soon after the .71 update rolls out. This update would only apply to the PC release of Windows 10 for consumers.

As to why the staggered approach, we will leave that to the engineers. It is not clear if the update will come all at once or Microsoft will wait a few hours.

Not much is known about what is in either the .71 or .75 update, but new features are likely not on the table. Instead, much needed OS optimizations, performance improvements and all-around bug fixing are likely the big changes. The last minute inclusion of .75 – if it holds true – suggests some last minute bug fixing that was completed in time

Microsoft will likely share more details in a blog post should the updates go live today. Likewise, updates for core apps are likely to follow over the next few days to match the OS refresh.

Finally, this update does appear to be a general release and not for Insiders. However, we do not have absolute confirmation on that at this time.

Windows 10 Mobile

As per our original report, we are still expecting Windows 10 Mobile build 10586.71 to be released as early as this week likely for those on the Fast Ring of the Insider program.

Microsoft has, at least, one time in the past published both updates for PC and Mobile at once. However, they have also staggered releases, and we would not be surprised if that happens here as well.

Build .71 is likely to have much need bug fixes for the Lumia 950, Lumia 950 XL, Lumia 550 and all of those on the Insider Fast Ring perhaps including a fix for the supposed Message backup bug that causes excessive data drainage.

Once feedback has been collected, Microsoft would likely push that update (or a later one) to production for all Windows 10 Mobile users, not on the Insider program sometime in February.

Updates for Windows 10 and Windows 10 Mobile usually hit around the 10 AM PT/ 1 PM ET / 6 PM GMT timeframe or in less than an hour.