Starting with Windows 10 Microsoft is introducing three servicing branch options. These aren't "editions" of Windows like Home, Professional, or Enterprise but they describe how updates are managed.

  1. LTSB  - Long Term Servicing Branch
  2. CB    - Current Branch
  3. CBB  - Current Branch for Business

LTSB (Long Term Servicing Branch) 
Programs like Edge, Cortana, Store, Outlook Mail,  Outlook Calendar, OneNote, Weather, News, Sports, Money, Photos, Camera, Music, Clock, and the Store are not available.

Long term Servicing Branch for Windows 10 is identical to old versions of Windows where users receive Security Updates and bug fixes every month but no new features and enhancements will be installed. Minimum length of servicing lifetime of LTSB is 10 years.


The only supported edition for this branch is Windows 10 Enterprise LTSB, as it is intended for Corporate and Enterprise user. Windows 10 Enterprise LTSB supports release deployment by using Windows Update, Windows Server Update Services, Configuration Manager, and other configuration management systems:

 

If you require all the features of Windows 10, you have to switch from LTSB to CB, to accomplish this you will need to use an in-place upgrade.

      

CB (Current Branch)

–This is the latest version of Windows and is called Current Branch, this version receives all upgrades (new versions) and updates (patches) from Microsoft within a few days of their release.  CB is what all home users get and what most small business corporate Pro users will get. Version can be verified as(you wont be seeing Current Branch written as one can think of), this is the latest version: 1511 with Build 10586 when this document was published:

CBB (Current Branch for Business)
Current Branch Branch for Business is enabled by choosing "Defer Updates"  in Settings Apps >> Security & Update >> Windows Update >> Advanced Options.

This is also configurable via Group Policy:

  1. Open a Group Policy Object that is targeted at the machines you wish to use CBB.
  2. Navigate to Computer Configuration >> Policies >> Administrative Templates >> Windows Components >> Windows Update.
  3. Double click Defer Upgrades and Updates.
  4. Enable the policy and set a duration for upgrade duration.
  5. Click OK.


 

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Reference:

Windows 10 release information