Microsoft Invest

A major enterprise DSP with deep programmatic roots, historically serving large agencies and brand advertisers globally before consolidation into Microsoft Advertising.

Microsoft Invest was a demand-side platform (DSP) — formerly known as Xandr Invest and, before that, AppNexus — that has since been folded into the broader Microsoft Advertising platform.¹ It offered sophisticated campaign management capabilities, including support for first-party identifiers that enabled cross-domain and cross-device frequency capping without relying on third-party cookies.² It also integrated with data management platforms such as Mediarithnics, 1plusX, and Weborama, allowing advertisers to onboard and activate audience segments.² The shutdown applied only to the demand-side business, as the supply-side platform and publisher ad tech, Microsoft Monetize, was retained and continues to operate.¹ Microsoft determined that its commitment to more private and personalized advertising experiences was not achievable within the industry's existing DSP model, and as a result ceased supporting media buying through Microsoft Invest starting February 28, 2026.³ Source 1: adexchanger.com — Microsoft Is Shutting Down Invest, The One-Time ... Source 2: first-id.fr — Microsoft Advertising Invest (Formerly Xandr Invest) Source 3: microsoft.com — Empowering businesses for a future that is conversational, ...