Problem

Reader in Sandbox mode can’t read/write to registry after Outlook 365 MAPI gets loaded using SendMail – open a file in Reader and then go to File > Send File > Attach to Email. And thus, any changes to preferences are not retained.

Solution

You can manually tweak the registry as a workaround. Follow the steps below. Before you do this, read the possible side effects it may have on Acrobat Reader.

Possible side effects:

  • Acrobat Reader may hang.
  • After closing the draft mail window, you may not be able to open another PDF by double-clicking it.

Steps to tweak the registry:

  1. Open the registry: go to Run (Windows menu + R), type regedit.exe, and then click OK.

  2. Based on your installed version of product and release, navigate to the location and then create the key under FeatureState at the location listed below; the key is not present by default.

    For Acrobat Reader DC (Continuous):

    • Key: 4163520
    • Location: HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe Reader\DC\FeatureState

    For Acrobat Reader (Classic 2015):

    • Key: 4163520
    • Location: HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe Reader\2015\FeatureState
  3. Change the value of the key to "1".

  4. Restart Acrobat Reader.

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