We have been receiving this error occasionally on some clients running RDP on Windows 2003 Server.

Code:
msg:	ZmAddrBook is not defined
fileName:	http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938
lineNumber:	5381
message:	ZmAddrBook is not defined
name:	ReferenceError
stack:	("ADDRBOOK",[object Object],[object Object],[object Object],[object Array],"folder",null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5381 ("ADDRBOOK",[object Object],[object Object],[object Object],[object Array],"folder",null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5381 ([object Object],[object Object],[object Object],"folder",[object Array],null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5334 ([object Object],[object Object],[object Object],[object Array],"folder",null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5349 (null,[object Object],[object Object],"folder",null,null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5335 ([object Object],"folder",null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:5296 ("FOLDER",[object Object],[object Object],"folder",null)@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:17718 ([object Object])@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:17694 ([object Object])@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:17636 ([object Object],[object Object])@http://127.0.0.1:3804/zimbra/js/Startup1_2_all.js?v=101011163938:17553 ([object Object])@http://127.0.0.1:3804/desktop/login.jsp?at=6d66285c-fb2e-4575-96d0-bf862c6b353b:675 ([object Object],[object Object])@http://127.0.0.1:3804/zimbra/js/Startup1_1_all.js?v=101011163938:18797 ([object Object])@http://127.0.0.1:3804/desktop/login.jsp?at=6d66285c-fb2e-4575-96d0-bf862c6b353b:675 ([object Object],[object Object])@http://127.0.0.1:3804/zimbra/js/Startup1_1_all.js?v=101011163938:1130 ([object Event])@http://127.0.0.1:3804/zimbra/js/Startup1_1_all.js?v=101011163938:1081
Please help to resolve this.

Dipesh