I have the following question how can I hide some activities not to be visible to all employees. Now the sharing settings for Account and Contact are Public Read/Write and for Activities are controlled by parent. The main idea is that there some internal events that shouldn't be visible. The solution that I think is possible is to change the sharing settings to Private for Account and Contact and after that via sharing rules to expand the access. If anybody knows something else as solution I would be happy to read it here?