The 2009-2019 window sharpened the view of microbial life as ecologically versatile across extremes, with culture-independent surveys and metagenomics revealing niche partitioning and functional convergence among endolithic, lithic, halite, permafrost, and deep-sea vent communities. The period emphasized cross-environment comparisons and methodological harmonization, leveraging high-throughput sequencing, single-cell genomics, and in situ proxies to discern survival strategies under extreme osmotic, thermal, and pressure stresses, while foregrounding astrobiological implications and biosignatures in mineral matrices.