I have recently had several users experience a problem within Adobe Acrobat Standard whereby when using the basic OCR functions they receive an error message.
The error message states that the imaging service is either not available or is not responding.
This seems to be caused by a memory overload when using OCR on large documents.
To revive the service you will need to close down Adobe and then in the task manager end and instances of “capserve.exe”
Once you have done that try performing OCR on a few pages (10-15 or less) at a time. This reduces the instances of the problem significantly!