All of this Samba4 beta1, Openchange & SOPE&SOGo downloaded from sogo.nu site as v2.0.0rc4 verison, Dovecot 2.0.19, Exim 4.76 are installed on Ubuntu 12.04
Server TLS, as client MS Outlook 2010 is used. Dovecot and Exim are authorized through built-in Samba4 LDAP backend.
At the moment there is other serious bug in SOPE/SOGo part of appliance what crashes Samba4 not to a Panic position, but however crashes Samba like that MS
Outlook doesn' t start anymore after that and MS Outlook is able to start after Samba4 restart only.

So, there are some users what are added to Samba4 and expanded for Openchange, at some of them password is the same with login name, at other password
differs from login name.
All users are successfully added to MS Outlook (control panel->mail->accounts->creates->Exchange->... and so on) , repeat, all users.
After that user with password equals with its login name is logged in to SOGo by MS Outlook successfully, and if it is first user login, mail folders are
created also.
And there is no Samba4 crash in this case.
But user with password differs from its login name is not able to log in to SOGo by MS Outlook successfully.
It seems that MS Outlook are openned, user actually can see mail folders list in MS Outlook, and it is all good thing in this case.
But actually user is not logged in to SOGo, can' t receive mail and connection with the appliance is broken down.
If it is first user login, mail folders are not created.
It is important that in case of using MS Outlook user with password differs from its login name is not authorized through IMAP4 (Dovecot) server (there is
wrong password message in IMAP server log file) that is user can' t pass IMAP4 server authorization if it uses MS Outlook.
But using MS Outlook user with password equals with its login is authorized through IMAP4 (Dovecot) server successfully that is such user (user has
pass=login) passes IMAP4 server authorization using MS Outlook.
And in case of situation described above (user wit password differs from its login uses MS Outlook) , connection with the appliance is lost with the
following error log messages (it is snapshot from big log) :

namespace is sogo:// and backend_uri is 'Administrator:Administrator@mail/folderINBOX/'
[2012/07/01 20:04:15, 0] MAPIStoreSOGo.m:155(sogo_backend_create_context)
[SOGo: sogo_backend_create_context:155]
2012-07-01 20:04:15.503 samba[19802] METHOD '+[MAPIStoreContext openContext:withURI:connectionInfo:andTDBIndexing:]' (226) -- uri: 'Administrator:Administrator@mail/folderINBOX/'
Jul 01 20:04:15 samba [19802]: <MAPIStoreMailFolder:0x8d56cf8:(null)> -init
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/dcesrv_exchange_emsmdb.c:680(EcDoRpc_process_transaction) MAPI Rop: 0x01 (8)
[2012/07/01 20:04:15, 0] mapiproxy/libmapistore/mapistore_interface.c:339(mapistore_del_context)
mapistore_del_context: context_id to del is 1
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/dcesrv_exchange_emsmdb.c:680(EcDoRpc_process_transaction) MAPI Rop: 0x02 (8)
[2012/07/01 20:04:15, 0] mapiproxy/libmapiproxy/mapi_handles.c:292(mapi_handles_add)
We have found free record 0x5
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/emsmdbp_object.c:457(emsmdbp_object_open_folder)
emsmdbp_object_open_folder: opening openchangedb folder
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/emsmdbp_object.c:413(emsmdbp_object_open_folder)
emsmdbp_object_open_folder: opening base mapistore folder
[2012/07/01 20:04:15, 0] mapiproxy/libmapistore/mapistore_backend.c:341(mapistore_backend_create_context)
namespace is sogo:// and backend_uri is 'Administrator@fallback/0x33031b0000000001/'
[2012/07/01 20:04:15, 0] MAPIStoreSOGo.m:155(sogo_backend_create_context)
[SOGo: sogo_backend_create_context:155]
2012-07-01 20:04:15.572 samba[19802] METHOD '+[MAPIStoreContext openContext:withURI:connectionInfo:andTDBIndexing:]' (226) -- uri: 'Administrator@fallback/0x33031b0000000001/'
Jul 01 20:04:15 samba [19802]: <MAPIStoreDBFolder:0x8dfe850:(null)> -init
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/dcesrv_exchange_emsmdb.c:680(EcDoRpc_process_transaction) MAPI Rop: 0x1c (16)
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> -init
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> -retain
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> -release
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> restriction set to EOQualifier: 805371935 = 'Conflicts'
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> -release
Jul 01 20:04:15 samba [19802]: <0x0x98d0cf8[MAPIStoreDBFolderTable]> -dealloc
Jul 01 20:04:15 samba [19802]: <MAPIStoreDBFolder:0x8dfe850:0x33031b0000000001> METHOD '-[MAPIStoreFolder createFolder:withRow:andFID:]' (383)
/usr/local/samba/sbin/samba: Uncaught exception MAPIStoreIOException, reason: unable to fetch created folder
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/nspi/dcesrv_exchange_nsp.c:1394(dcesrv_exchange_nsp_unbind)
dcesrv_exchange_nsp_unbind
[2012/07/01 20:04:15, 0] mapiproxy/servers/default/emsmdb/dcesrv_exchange_emsmdb.c:1962(dcesrv_exchange_emsmdb_unbind)
dcesrv_exchange_emsmdb_unbind

And after that MS Outlook can' t start normally, that is it can' t connect to the appliance with any user (if login name equals to password or not) .
MS Outlook can start normally (with user whom has login name = password) after Samba4 restarting only.

Speaking about login via Web GUI, it works any case.
User with its password equals its login name can login successfully, user with it password don' t equals its login name can login successfully also.
If it is first user login, in both cases, folders are created (if user logs in through Web GUI) .

All users can login via Web GUI even after Samba4 crash, mentioned above, that is:

• attempt to login by MS Outlook with user with password differs from its login name;
• Samba4 crashes;
• even after that any user (login = pass or login != pass) can login successfully but via Web GUI only.

It is important that in case of using Web GUI user with password differs from its login name just as user with password equals with its login is authorized
through IMAP4 (Dovecot) server successfully that is all users passes successfully IMAP4 server authorization if it uses Web GUI.

Roughly speaking:

two user types with:
login=pass;
login!=pass or login<>pass.

two client types (login ways) :
MS Outlook;
Web GUI.

results:

login by MS Outlook:
user has login=pass -> login successful both to MS Outlook (see mail folders list) and to appliance (can receive mail) , mail folders are created (if it is
first login) , passing through IMAP4 server authorization, no Samba crash mentioned above;
user has login<>pass -> login unsuccessful to MS Outlook (you can see mail folders list but it is all you can) and to appliance (can not receive mail) , mail folders are not created (if it is first login) , no passing through IMAP4 server authorization, getting Samba crash mentioned above;
conclusion: MS Outlook doesn' t continue to work without Samba4 restarting.

login by Web GUI:
user has login=pass -> login successful both to Web GUI (see mail folders list) and to appliance (can receive mail) , mail folders are created (if it is
first login) , passing through IMAP4 server authorization, no Samba crash mentioned above;
user has login=pass -> login successful both to Web GUI (see mail folders list) and to appliance (can receive mail) , mail folders are created (if it is
first login) , passing through IMAP4 server authorization, no Samba crash mentioned above.
conclusion: Web GUI continues to work without Samba4 restarting.