Hi @Anonymous ,
Are you using Outlook for Mac client along with Cisco Webex Meeting add-in like below? If so, before going further, please make sure you have already update your Outlook to the latest version.
I did a lot of search about know issues and only found this known issue related to Webex plugin: "Unsupported version of Webex plugin is detected" message, just check if this could be helpful to you.
Does the freeze issue only happen in Outlook? Or happen to all the Microsoft Office programs as well?
Does this issue only happen to one specific user? Or all the users in your working environment?
To confirm if your issue is related to your Outlook client, please try to temporarily remove this specific add-in from your Outlook and see if the issue has any difference.
According to my tests, I added Cisco Webex Meeting Scheduler via Get Add-ins button in Outlook(Version 16.40) and run Outlook for quite a long while, but seems have not met the freeze issue you mentioned. (Due to the limitations, I can only proceed to the following interface, and have not met any performance issues yet, for your comparison)
And if Outlook still have freeze issues after removing this specific Add-in, I'm afraid that your issue might be related to your Outlook client. Please try to completely uninstall your Office for mac and then re-install it to see if it works.
If Outlook could work fine without this specific add-in, seems that your issue might be more related to the add-in itself. Since here we mainly focus on general issues about Outlook desktop client, it is suggested to post your feedback of add-ins to developer forums via the steps in this article: Office Store FAQ.
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