Users are reporting that they are not able to rollback after 10 days of installation of Windows 10 Anniversary Update. Many users started noticing the problems only after 10 days - and they are left with no option, but to stick with the Anniversary Update.

It appears that the Rollback period has been reduced to 10 days in Windows 10 Anniversary Update

It would have been nice if Microsoft had officially informed users that the rollback period would be reduced from 30 days to 10 days in Windows 10 Anniversary Update.