If you are deciding whether to upgrade, here is how XI compares to the modern DC (Document Cloud) version.
Prior to version 11, many advanced commenting features were locked behind the paid Acrobat Pro version. Adobe Reader 11 opened up the "Comment" pane to everyone, allowing users to use sticky notes, highlighter tools, lines, shapes, and stamps without needing a premium license. 2. Fill & Sign (Smart Forms) adobe reader11
For organizations subject to compliance (HIPAA, PCI-DSS, GDPR), using Reader XI is prohibited because unpatched software constitutes a security violation. Adobe’s official recommendation is to upgrade to (continuous release), which receives monthly security updates. If you are deciding whether to upgrade, here
: Opening, viewing, and printing PDF documents. Annotation : Highlighting text and adding comments to files. : Opening, viewing, and printing PDF documents
Reader XI supported "Portfolios"—a container file that could hold multiple PDFs, Word docs, and multimedia files in one interface, allowing users to navigate complex project folders easily.
Reader XI introduced a button to export PDFs to Microsoft Word or Excel. Note: This required an Adobe online services subscription or a limited number of free tries.
Adobe Reader 11 made it possible to type directly into PDF forms that weren't originally designed as "fillable." The "Add Text" tool allowed users to place text anywhere on a document. More importantly, it introduced the ability to apply electronic signatures, making it easier to return signed contracts without printing and scanning. 3. Enhanced Security (Protected Mode)