In the Web App under Notifications the filtered views (anything other than All Messages) is limited to 50 items, and you do not have the option to go to the next page.

For example our HR department set Tasks for each employee to review their Job Description. They were hoping to be able to do away with using a spreadsheet to track emails by seeing who was left under their Sent Tasks. But they are still using the spreadsheet and manual reminders since they weren't able to access more than 50 assigned tasks to send reminder emails.