WindowsForms don't works correctly with multithreading?

You know that WindowsForms applications must run in a STA apartment, because of the underlying 
technologies such as OLE that requires STA.

Some days ago I read that ThreadPool uses a MTA apartment (obvoiusly): are there any problems 
in using WindowsForms with ThreadPool? 

Moreover: a control can be accessed only by the thread that created it. If in a WindowsForms app
I start a new thread and that thread modifies something in the forms what happens? 
A thread handler run inside the thread that fired the event: if the form handle an event raised by an other
thread and the event handler modifies some properties of the form itself, are tehere any conflicts?

In short: are there any conflicts in working with multithreading WIndowsForms apps? If so, which?

Thanks,
Luca

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