Plus! never provided a function to
remove the text; rather, it could
replace the text using the
registry:
HKCU\Software\Patchou\MsgPlus2\your@email.com\Preferences
ChangeSecurityWarning (DWORD) Default: 0
SecurityWarningTxt (String) Default: (local specific)
If ChangeSecurityWarning is set to true (1), the security warning displayed at the beginning of chats is modified to match the text specified in SecurityWarningTxt
It is MSN Messenger itself that removes the text: the registry key "HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\PerPassportSettings\(your passport id) -> WarningMsgCount" matters. See
CookieRevised's reply to Get rid of the warning text at the start of chats.