We have certain client data which must be encrypted at all times. The part we have been struggling with is encrypting files on network shares.
Currently we have network folders encrypted using PGP Netshare. This works pretty well for file encryption but it sucks for files which need to be accessed by two or more people simultaneously, i.e. Microsoft Access. If two people access the file the file will become corrupt.
We have tried Microsoft EFS, which is pretty straight forward, but difficult to configure for multiple users. You can't set multiple users to decrypt a file without explicitly adding their cert to the file though Windows Explorer (from what we have discovered).
Bitlocker was suggested as a clean way to encrypt files and configure across the enterprise. From what I read it appears like it will work for us. It states that the system drive needs to be encrypted as well and that is where issues come into play. It is a lot of configuration to setup bitlocker properly and I am not sure if it is a good solution for what I need to do.
So I ask you, security specialists, what is the industry standard for securing, encrypting data files on a windows file server?