What doesn't work?
Do the combo boxes have no data in them?
Are they bound to a Field and not setting it when you pick one?

MS Article: Access specifications
Number of controls and sections that you can add over the lifetime of the form or report = 754

Yeah, I'm pretty sure I've had forms with more than 100 combo boxes before. Like Alex said, what specifically isn't "working?"

When you click on the combo box there is nothing in it. When I moved the boxes (that would be over the 90) to another form they work fine.

That's definitely unusual. I've never encountered that problem before. Perhaps try to come up with a solution that doesn't involve using so many boxes on one form? You can split the data up into multiple forms or subforms.

I did move some of the boxes to a different form and they are working fine now. The database is running in Citrix and the server is in Beligium. I notice errors in Citrix that I don't see if the same database is running on a local hard drive. I'm sure there is an issue in the Citrix environment.

That's very possible. I've never used Citrix on a development machine.