[BlueOnyx:16401] Admin Webmail 'missing' after update

[George F. Nemeyer]

After updates to 5016R, with admin login to GUI, most left-hand menu items
work, but with update (squirrelmail.noarch 1.4.8-21.el5.centos installed):

Personal Profile -> Webmail

gives the folowing in the main panel window:

          File not found.
          The requested URL was not found on this server.

Admserv access log shows a 404:

98.100.9.30 - - [03/Nov/2014:20:23:06 -0500] "GET
/base/squirrelmail/index.php HTTP/1.1" 302 -
"https://bobcat.tigerden.com:81/nav/jsLibrary.php" "Mozilla/5.0 (X11;
Linux i686; rv:11.0) Gecko/20100101 Firefox/11.0"

98.100.9.30 - - [03/Nov/2014:20:23:06 -0500] "GET
/webmail/src/login.php?loginname=admin HTTP/1.1" 404 1227
"https://bobcat.tigerden.com:81/nav/jsLibrary.php" "Mozilla/5.0 (X11;
Linux i686; rv:11.0) Gecko/20100101 Firefox/11.0"

ERROR Log shows:

[Mon Nov 03 20:23:06] [error] [client 98.100.9.30] File does not
exist: /usr/sausalito/ui/web/webmail, referer:
https://bobcat.tigerden.com:81/nav/jsLibrary.php

There is no such file, but then, there is no such file on
a 'good' non-updated box either!

Logs for an older, NOT updated box where Webmail brings up Squirrelmail
(squirrelmail.noarch  1.4.8-5.el5.centos.13  installed) shows:

Access log -

98.100.9.30 - - [03/Nov/2014:20:11:02 -0500] "GET
/base/squirrelmail/index.php HTTP/1.1" 302 -
"https://unci.tigerden.com:81/nav/jsLibrary.php" "Mozilla/5.0 (X11; Linux
i686; rv:11.0) Gecko/20100101 Firefox/11.0"

98.100.9.30 - - [03/Nov/2014:20:11:02 -0500] "GET
/webmail/src/login.php?loginname=admin HTTP/1.1" 200 2703
"https://unci.tigerden.com:81/nav/jsLibrary.php" "Mozilla/5.0 (X11; Linux
i686; rv:11.0) Gecko/20100101 Firefox/11.0"

So whatever file the web server was looking for was found.

I'm guessing the file name in the updated sausalito is wrong?