Office 2019 for Mac Faces July 2026 Certificate Expiry With No Microsoft Fix

A Microsoft 365 authentication certificate expires July 13, 2026 on macOS and iOS. Microsoft will not issue updates for Office 2019 for Mac—out of support since October 2023—leaving affected installations unable to connect to Microsoft 365 services without migration. Windows and Android users are unaffected. IT teams should audit for remaining Office 2019 deployments now.