That is very inconvenient. Prior to Acrobat DC, indexing was a standard feature. I don't want a monthly bill, I want to pay cash for a product and own it. Removing features and creating an endless billing cycle may seem like good business practice in the short run, but I do believe my funds might be better spent changing companies. Sorry, Adobe, you are about to lose another paying customer.

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I'd like to correct two points.

1. I'm pretty sure this has been a feature only in Acrobat Pro, since Acrobat Pro was launched (version 6.0). Of course Adobe sometimes do mysterious things; perhaps sometimes it is in Standard.

2. Your assumption that Pro is subscription only is wrong. Acrobat Standard and Acrobat Pro: two products. Perpetual license and subscription: two ways to pay. That's four in all. Note though that the subscription version is already upgraded way ahead.