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There are multiple causes for this but the suggested troubleshooting process is as follows (run these as separate processes incrementally, hopefully the first will solve it for you!!):

  1. ensure all windows and office updates are applied, then reboot;
  2. uninstall the LawMaster outlook addin and reinstall it, then reboot;
  3. disable all 3rd Party Outlook addins (with the exception of the LawMaster Add-in), then reboot;
  4. disable all Word addins, then reboot;
  5. make sure you are using 32bit Outlook and Word and only one version of Outlook and Word is installed.
  6. This is a known issue with Outlook and has also been reported by other 3rd party addins:
    1. Below are links to their knowledge bases where they have mentioned workaround steps:
      1. https://help.act.com/hc/en-us/articles/360024239574-Error-Unable-to-cast-COM-object-of-type-Microsoft-Office-Interop-Outlook-ApplicationClass-to-interface-type-Microsoft-Office-Interop-Outlook-Application-When-Synchronizing-Act-and-Microsoft-Outlook-
      2. https://support.boyum-it.com/hc/en-us/articles/206772337-Outlook-issue-Unable-to-cast-COM-object-of-type-Microsoft-Office-Interop-Outlook-ApplicationClass-
  7. run the repair Office process - refer to https://support.office.com/en-us/article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b?CorrelationId=d83839a0-0b14-4eeb-bbb1-27b024d29d24&ui=en-US&rs=en-US&ad=US&ocmsassetID=HA010357402, then reboot;
  8. recreate the Outlook profile, then reboot;
  9. recreate the Office profile, then reboot;
  10. reinstall Office.
  11. recreate the Lawmaster User Data folders with Appdata\Roaming\Lawmaster\<Server>\<Username>
  12. Most of the time it gets fixed by checking / running the MS Office updates 

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