Thanks Aaron,

Unfortunately, at my work I can not access most of Control Panel. But thanks for the point re Word. I havve taken to just expoerting all the modules and forms and then reimporting them into a new project - which works fine and also reduces the file size.

I have a theory that this problem is related to the project file storing information regarding previous actions - ie it is storing all my undos! I have noticed that sometimes when I open the VB editor I am presented with undo option from last time I used Outlook - this info must be getting stored somewhere so mayne in the project file?

The only other thing I can think of is that, as part of my programme, I have Outlook run an Advance Search to find a particular Note in the Notes Section where I store user data. This works very well, but I wondered if these searches were building up some bank of data somewhere? I only mention it because I have never used Advanced Search before so dont really know if thhere are any possible issues like this.

More recently, the bloating effect seems to have reduced. Yesterday it grew from 120k to 580k over the course of the day (without anything significant being added to the code)! Still annoying but manageable!

Chris