The "Additional Account Info" tab shows extra info for AD users like Last Logon, Last Logoff, Last bad logon, and more.

If you do not see this tab the following needs to be down.

Step 1: Download Acctinfo.dll

Step 2: Save Acctinfo.dll to C:\windows\system32{color}

Step 3: Open CMD and run the following command 

regsvr32 %systemroot%\system32\acctinfo.dll

Now when you view user in AD you will have teh Additional Account Info Tab