Is it ok to use VS Express edition to create small utilities at work?

Question

I am developer working mainly in C# who has now been assigned to a Data Migration project. (Sad story, I know. But that's for another day). We are currently creating column-to-column mapping between tables in an Excel worksheet in a particular format.

Now as many developers, I too hate this kind of mechanical work. I was thinking of creating some sort of small app which will help me in automating this process to a large extent. For this I was thinking of using Visual Studio Express edition as my manager says that the project can't afford a full-fledged VS license.

Is it okay to do this considering the license terms of Express edition?