I have an Office Web Apps 2013 farm, unpatched since installation. It was initially installed with SP1 and there are 30 patches released since then. So I'm wondering if I have to apply every patch one by one or I can install only the last one, just as we do for SharePoint CU nowadays. Can anyone share some info on this, references or own experience?

1 Answer 1


Yes, they're cumulative. Generally they're presented as security patches, but those patches are the 'CU'. Don't forget the patching process for WAC:

  1. Remove the WAC server from the WAC farm
  2. Install patch/reboot
  3. Create a new WAC farm

Repeat steps 1 and 2 for the other WAC servers, but join them to the new farm you created with the first WAC machine to be updated.


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