From version 22.214.171.124 the utility is shipped with the outlook client
18 Jan 2019
If the Outlook add-on is disabled you can now quickly fix this using a new utility that fixes the registry settings for Outlook.
Download the tool to the client pc with the issue.
Version 2 (CRM user settings option added) - download and extract the files to a folder and then run RepairRegistry.exe https://www.dropbox.com/s/nlof7gh7p45794d/RepairRegistry.zip?dl=0
Version 1 - download and run RepairRegistry.exe https://www.dropbox.com/s/b1xl263tmn608vx/RepairRegistry.exe?dl=0
Run the application
and click the bug "Repair" button
Restart outlook and the Accelerator add-on should be visible again.