Dana,
Do you use jabber-config.xml file? If you do, we can try adding a parameter that used to work in the older versions. <HonourLastWindowSate>true</HonourLastWindowSate> - this is the parameter that can be tried. But, remember that users have to click red x on Jabber to minimize it to system tray before the next logon. Then, the above parameter should take effect. Let me know how it goes.
Looks like this:
<?xml version="1.0" encoding="utf-8"?>
<config version="1.0">
<Policies>
<Screen_Capture_Enabled>true</Screen_Capture_Enabled>
<EnableSIPURIDialling>false</EnableSIPURIDialling>
<HonourLastWindowState>true</HonourLastWindowState>
<ctiwindowbehavior>Never</ctiwindowbehavior>
</Policies>
-Sankar