[Dovecot] Need subfolders - convert to Maildir & how?

I just installed Dovecot and it is working great.

But I need subfolders. Does this mean I need to convert to Maildir format? I found several tools to do the conversion, but is there anything that needs to be changed in Dovecot to make the switch?

Any advice appreciated.

Thank you, Michael Hipp Heber Springs, AR, USA