Microsoft today resumed delivery of Windows 10 previews to its Insider program participants after taking a four-week break.

The new preview, designated build 11099, was offered to beta testers who have selected the “Fast” ring, or delivery track.

As with its predecessor — which appeared Dec. 16 — build 11099 has no major new features or visible changes. “Our focus through the holidays was on structural improvements to OneCore, which is the shared core of Windows across devices,” wrote Gabriel Aul, engineering general manager for Microsoft’s operating systems group, in a post to a company blog Wednesday.

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