In 2021, the "Acropalypse" vulnerability (though technically for Mac Preview) highlighted how outdated PDF tools leak data. Older Acrobat versions are similarly vulnerable to data exposure.

For those managing business workflows, Acrobat 11 offers sophisticated form and annotation tools: Announcing Adobe Acrobat Pro 11 - Wright State University

Comparing Acrobat Pro 11 to the current version (Acrobat DC/Pro 2024) highlights the shift in software consumption: