You will need to first upgrade to RU6 (11.0.6005) before going to RU6MP3 (11.0.6300).  You can find the download in fileconnect as well.  There have been several improvements since MR2 that will make it worthwhile.  You will need to assign packages to the client groups to upgrade them.  All of this can be found in:

http://www.symantec.com/business/support/index?page=content&id=TECH155655

Hi, 

  Check this kb article for Migrating for RU6a .

http://www.symantec.com/docs/TECH131653

Check this for RU6 MP3 : 

http://www.symantec.com/docs/TECH155655

Follow the instructions and it will be successful .

The latest version for SEP 11.0 is SEP 12.1...

hello

your upgrade path should be as below,

11.0.2-->11.06a ----> 11.06 MP3

Installation and Migration documents for Symantec Endpoint Protection 11.x

http://www.symantec.com/business/support/index?page=content&id=TECH94405&key=54619

however, Now you can directly upgrade to Endpoint protection 12.x

Please check out the below link for more information,

Installation and Migration Documents for Symantec Endpoint Protection 12.1

http://www.symantec.com/business/support/index?page=content&id=TECH163707&key=54619

Your satisfaction is very important to us.If you find above information helpful or it has resolved your issue...please mark it accordingly :)

If you are going to go through the trouble of upgrading your system (And you really should, MR2 is pretty old and there are so many fixes and improvements in the later versions), I would suggest going straight to SEP 12.1.

The upgrade methodology is the same as going to RU6.

Basic steps is:

1) Upgrade the SEPM Server.
To do this, run the SEPM 12.1 installer on the SEPM 11 MR2 box. It will automatically detect SEPM 11 MR2 and upgrade it.

2) Upgrade our clients
Some of the previous posts gave some information about upgrading clients -- so I won't go over this in detail, but your basic options are

1. Auto-Upgrade feature. This is like a 'policy' setting you set in the SEPM console that will tell the manage clients to download and install the upgrade.
2. Export a client package. This will give you an executable that you can post on a share or give to people on a thumb drive.
3. Email update (New feature in 12.1). You can also email your group the client package. What this does is post a copy of the exported package on the SEPM web server, and then helps you create an email that contains a web link to the upgrade package on SEPM.

Whether you go from SEPM 11 RU6, or SEPM 12, the upgrade technique is the same.

I would greatly recommend going straight to SEPM 12. It's about the same amount of work, but the protection technology in SEP 12 is much better than the SEP 11 line. If you are going to go through the trouble of upgrading, I recommend going straight to SEP 12.

There are a lot of benefits to upgrading, no name a few:

• Update Deltas in MR2 are very slow and very CPU intensive. Later versions use  the new xDelta system with is much faster, smaller, and takes a lot less CPU.
• Better performance on both the SEPM server and SEP clients.
• In SEP 12 scan times have been reduced.
• In SEP 12, the protection technology is not just a little better -- there is completely new technology! You really want it.