Modifying Db Design (internal Message System)

Hi,

I currently have an internal message system, and I want to modify the db design so users can create their own custom folders.

Currently I have just this table in use, with the bolded column, the one I want to add. With this design, I am thinking of defaulting each "folderID" in this table to a value of 0, which will denote the standard inbox folder. I think this is better because I don't think its necessary or beneficial to have each user have their own row in this table just for their standard inbox.


CREATE TABLE [dbo].[tblMessage](
[MessageID] [int] IDENTITY(1,1) NOT NULL,
[MessageFrom] [int] NOT NULL,
[MessageTo] [int] NOT NULL,
[Message] [varchar](1500) NULL,
[prevMessage] [varchar](500) NULL,
[Subject] [varchar](50) NULL,
[date] [smalldatetime] NULL,
[Checked] [tinyint] NULL,
[deletedbySender] [tinyint] NULL,
[deletedbyRecipient] [tinyint] NULL,
[IP] [varchar](15) NULL,
[folderID] [int] NULL
)

I am planning on adding a table like this below


CREATE TABLE [dbo].[tblMessage_folders]
(
[folderID] [int] IDENTITY(1,1) NOT NULL,
[userID] [int] NOT NULL,
[folderName] [varchar](50) NULL,
[dateCreated] [smalldatetime] NULL,
)


Any differing opinions, or anyone agreeing with me I would love to hear your opinions. I'm just want to be sure this doesnt create any problems I might not be seeing.

Thanks once again!!
mike123