In fact, for the time being, it will still not be possible to fully edit a PDF file due to app limitations in Microsoft Teams. However, yes we will be able to add comments, organize the document pages, compress it, export it or protect it with a password.
Adobe Acrobat may be the default application within Microsoft Teams
The main novelty of this integration is that Microsoft Teams admins will be able to set Adobe Acrobat as the default app for PDF files. In this way, there will not be an application to open these files in Windows and a different one, in Microsoft Teams, but a single application will be used.
Users will be able to use this app to access files stored in SharePoint and OneDrive. In case of having a subscription to Adobe Creative Cloud, they will be able to use Adobe’s collaboration mechanisms, encrypting the document at source, destination and during transport.
To use the app as a viewer or set it as default, no subscription required to Adobe Creative Cloud. However, it will be necessary to have Standard or Pro subscriptions to use the collaboration features.