Virtualmin setup issues wit IMAP

OS: CentOS 6.5 x64
Running Virtialmin and hosting a few domains.

I am moving my mail services off my ISP to my own hosting box (due to the fees they charge for several mailboxes on the same account).
Their current webmail system is roundcube-based (as is mine) and all mail hosting at their end is Linux based.

I'm using Outlook 2013 which I know hs some issues with odd IMAP behaviour but from my ISP when moving folders to the IMAP connection it auto-provisioned them on their server.
With my own hosting if I drag a folder to my hosted server the folder doesn't show up in the likes of RoundCube.
I can create folders in Roundcube and subscribe to them in my IMAP folders in Outlook but they don't show up in the list.

It's puzzling since it works on the ISP end but not my hosting end.
Dragging mail to the likes of my hosting's inbox, sent, etc propogates fine onto the hosting server & is visible in RoundCube so I'm at a bit of a loss as to what's going on..

Any ideas?
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kiwistagAsked:
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gheistCommented:
You need to enable IMAP IDLE support maybe in both client and server. Otherwise there is no way for other client to know that mailbox has changed.
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kiwistagAuthor Commented:
I think that is already enabled (yet to re-go through the config) as it was one thing I already checked.

If I create the folder in Outlook then create it in say RoundCube with the exact same name (or vice versa as long as one exists) it then links up quite happily.
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kiwistagAuthor Commented:
Found a workaround, but gheist's post is correct that IMAP IDLE is required.
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