I am curious about the effects of user profiles after an employee leaves an organization. If former employee John Doe had a domain account of acmeinc\jdoe and his replacement, Jane Doe, also had the domain account of acmeinc\jdoe, how does it impact user permissions in the environment? Since SharePoint sees that they are the same domain account (despite being separate users), is it smart enough to create a new user profile for Jane?
In a recent project, I imported 200 new users into an existing environment; 2 of the imported users cannot access the SharePoint site. When I look through the _layouts/userdisp.aspx?ID= parameter value for these 200 uers, I see a number much lower than it should be for the 2 users without access. This makes me wonder if the import just overwrote a former user for these 2 people instead of creating a new user profile account.
Before anyone says it is a permissions issue, Jane Doe is added in the default "Site Members" group for the site. This, of course, was the first thing I checked.
User profile is synced through Bamboo Solutions.