Update a qualifying 1099 Pro environment to the 2026 Enterprise release with the multi-user unlimited upgrade designation. EU-26-MU identifies the software upgrade offering for the 2026 version of 1099 Pro Enterprise. The release year, Enterprise edition, and multi-user unlimited designation together define the scope of this ordering code. Enterprise identifies the edition associated with this upgrade, while Multi-User Unlimited identifies its named licensing designation. This combination separates the offering from upgrade selections that target a different release year, edition, or user-access designation. It is intended for environments already aligned with the applicable 1099 Pro upgrade path. Match the existing software environment to the 2026 Enterprise upgrade requirement before selecting this code. The upgrade designation is significant: it identifies a transition to the named 2026 Enterprise release rather than a general-purpose software item. Retain the exact EU-26-MU code when documenting the selected 1099 Pro Enterprise upgrade and its multi-user unlimited scope.