[FDE] Changing Encryption packages

[jfvanmeter at comcast.net]

 Hello everyone, I'm currently working on a project to replace EFS with a different encryption package. I was hoping you all would share any pit falls that you have experenced or that you have heard about when doing this. 

I plan to run this in two or three phases

1. remove EFS from Group Policy and use cipher/script to decrypt all files on the workstation. and backup files.

2. implement the new encryption package

I have roughly 40k workstation to implement this on, so any help insite would be great.

thank you

Take Care and Have Fun --John