Access room/equipment mailboxes in cached mode

Hi,

We are using Outlook 2010 against Exchange 2010 SP1. We use many room and equipment mailboxes.

Noticed that calendar changes on the room/equipment mailboxes are very slow to reach the clients when clients use cached mode. Updates works directly when we disable cached mode.

Is there a way to speed up the update frequency when using cached mode so the clients can see the changes faster.

Thanks,