The recent logins are registered every time when someone is loged in the U2000 client, but if you want to disalbe it please follow these steps:

Step 1. Setting parameter:
SettingTool -cmd setparam -path/imap/security/common/ShowLoginInfo -value "0"
Step 2. Checking whether the parameter is ok:
SettingTool -cmd getparam -path/imap/security/common/ShowLoginInfo
Step 3. Restart all Desktop services. 0X01 replaced by realnum.
svc_adm -cmd restartsvc DesktopService0X01
Step 4. Login U2000 client again.