Hi,
Happy New Year !!!
Check this article :
https://www-secure.symantec.com/connect/articles/hot-move-sepm-one-server-another-server
I would recommend you to upgrade to the latest SEP version. Latest SEP version is SEP 12.1 RU2.
I believe to all the existing SEP 11 customers upgrade to SEP 12.1 will be a free upgrade.
In your case you can directly upgrade from SEP RU5 (11.0.5002.333) to SEP 12.1 RU2.
Check till date SEP release here: http://bit.ly/m0vOJp
There are many advantage if you are upgrading to 12.1, few of them are listed here
Few differences between SEP 11.x and SEP 12.1 EE : http://bit.ly/JpDR3U
If you still looking for an upgrade on existingn platform then you will have to go through multiple upgrade as per below:
SEP RU5 (11.0.5002.333)--> SEP 11.0.7000 (RU7) > SEP RU7 MP3
Migrating to Symantec Endpoint Protection 11.0.7300 (RU7 MP3)
http://www.symantec.com/docs/TECH199189
Now question remains what's the best option to move.
If you have limited number of clients & if possible then can go with fresh install.
install latest SEP version on winodws 2008 server and restore client communication relacing sylink.xml
If possible provide more information
1) Total number of SEPM's in the network?
2) Total number of Clients in the network?
3) If any GUP is configured?
4) Are there any custom policies are configured?