adrianh wrote:so my observation was correct...it seems yes a new mailbox is acknowledged per cycle but if Importer has it registered already and something subtle changes like alias or display name then the matches done work any more.
The central service will check every hour for mailbox data (as Brian says). Restarting it will force an update.
However each time it does this is completely replaces the existing data from the previous check. All we're after is the actual mailbox name for each user (so we don't look for aliases etc.) and this is then just used to present the list of available mailboxes for you to chose from.