Specifically on Outlook desktop client versions, when using the Colligo add-ins, after a Colligo side software system upgrade a number of users reported being stuck 'loading' the add-in due to the Microsoft caching mechanism. The solution is to clear the cache.

Issue and Resolution

• Identification of the problem
• Explanation of the Problem
• Solution

Identification of the problem

• If your Outlook desktop client faces a continuous Loading Colligo Email Manager…  message on sign-in as in the screen shot
  
   

Explanation of the Problem

• Microsoft are caching pages client side that cause this and their current recommended solutions is to clear the client side cache. 

Solution

Microsoft have published a document covering how to resolve this issue.

https://docs.microsoft.com/en-us/office/dev/add-ins/testing/clear-cache

Please follow the instructions in the link above

On Windows for quick reference:

• The Microsoft cache is located on the client machine %LOCALAPPDATA%\Microsoft\Office\16.0\Wef folder. 

  
  

  Please clear the client-side cookie/cache from the machine and try again if still an issue please open as Support ticket.

   

  1. Clear the Outlook cache by removing the files from below location - 
   %LOCALAPPDATA%\Microsoft\Outlook\RoamCache

   

  2. Clear office cache by removing the files from below location - 

  %LOCALAPPDATA%\Microsoft\Office\16.0\Wef

   

  3. Clear the cache and cookies from your edge/ web browser as well.

  
  

If your users still have an issue after following this process then please create a support case for further investigation