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Jingli Hu 3 activity custom field limit
As salesforce has 100 custom fields limit on activity and we heavily customize task and event and many fields were created by managed package. would like to know whether the fields created from managed package are counted on the limit?
It will not count on object-level, For example you have 500 fields limit and 100 are part of the managed package, still, you can use 500 fields. However, it will count on your organization limit per object.
Review below links for more information.
https://salesforce.stackexchange.com/questions/65546/custom-field-limits-for-managed-packages
https://help.salesforce.com/articleView?id=faq_distribution_installing_why_do_the_custom.htm&type=5
Hope above information was helpful.
Please mark as Best Answer so that it can help others in the future.
Thanks,
Vinay Kumar