1Samba4 alpha4 is not a final Samba release.  That is more a reference
2to Samba4's lack of the features we expect you will need than a
3statement of code quality, but clearly it hasn't seen a broad
4deployment yet.  If you were to upgrade Samba3 (or indeed Windows) to
5Samba4, you would find many things work, but that other key features
6you may have relied on simply are not there yet.
7
8For example, while Samba 3.0 is an excellent member of a Active
9Directory domain, Samba4 is happier as a domain controller, and it is
10in this role where it has seen deployment into production.
11
12Samba4 is subjected to an awesome battery of tests on an
13automated basis, we have found Samba4 to be very stable in it's
14behaviour.  We have to recommend against upgrading production servers
15from Samba 3 to Samba 4 at this stage, because there may be the features on
16which you may rely that are not present, or the mapping of
17your configuration and user database may not be complete. 
18
19If you are upgrading, or looking to develop, test or deploy Samba4, you should
20backup all configuration and data.
21
22We welcome your testing, please file bug reports at
23https://bugzilla.samba.org/, product: Samba4.  Please include as much
24information as possible, such as GIT revision SHA and backtraces.
25