Treeline wants to rebuild corporate IT from the ground up, starting with the everyday headaches most workers barely notice until something breaks. The San Francisco–based startup has raised a $25 million Series A led by Andreessen Horowitz to build what it calls a “modern IT operating system,” an AI and software-first alternative to the decades-old managed services firms still powering most corporate IT. The round comes as global IT spend is expected to climb above $6 trillion in 2026. “Basicall...