If you open a Excel or Word 2010 document that is stored on Alfresco 4.2c (the problem does not occur with Powerpoint) via CIFS, you get a message that the file is already open by "another user", even if it isnt.
This bug has been seen in many Alfresco versions, but also in the latest community release 4.2c (CIFS/Office 2010 - File locked after creation).
The reason for this seems that Office 2010 acquired more than one lock per open file and forgets to close at least one of them.
Since Office 2010 allows webdav Links to be used directly in File dialogs (open/save), and webdav does not seem to produce these issues, this is a viable workaround.
Also, under Windows 7 and later, webdav can be mounted just like a normal CIFS drive, which also avoids these problems.
(This has the nive side-effects that the server is only about half as busy as with CIFS, also if you serve the data via HTTPS, the data is encrypted which it isn't via CIFS).
