I am using ArcGIS Desctop 10.0 Service Pack3 and I'd like to sort the table of contents in alphabetical order but following Sorting the table of contents in alphabetical order I can't find the "Production TOC Manager" toolbar. Am I missing anything or do I need to activate anything?
The Production TOC Manager toolbar is a part of the Aeronautical solutions extension or possibly some other specialized extensions which can be purchased separately. I believe this extension also requires a Standard (formerly ArcEditor) or Advanced (formerly ArcInfo) level extension. If you have purchased these extensions, make sure to enable them in Customize--> Extensions. You should then be able to see and use the associated tools.
The only other way I know of to order items in the TOC alphabetically or otherwise is programmatically using some type of bubble sort and ArcObjects. If you have the VBA module installed you can try the code posted here. Unfortunately, as of version 10, VBA is not global (can no longer reside in main template) and you cannot share the tool among all instances of ArcMap. (Workaround is to save the VBA tool into a document and use that particular document as a starting point for all your other document then Save As...) Instead you could create an add-in using the same code which you will be able to access from all instances of ArcMap on your machine.
EDIT: I made the VBA sample into an ArcMap 10.2 add-in. It's a little slow with 20+ layers but it works. I tested on 60 layers and it worked fine. A-Z only. You can download it HERE. If it works fine, please rate it.