Grouping multiple subscriptions for streaming notifications

Hello,
I want to subscribe to Exchange (ver. 2010) streaming notifications in order to receive events for multiple mailboxes.
I don't want to open a separate connection for each mailbox, although from what I've read so far I need a separate
subscription per mailbox.
I read that it is possible to group subscriptions in batches of 200 so that the number of open connections is reduced.
I'm trying to do this in java and I have found no information or sample code to help.
Do I actually need to use impersonation to group subscriptions ? I'd rather not if possible.
And how can I combine multiple ExternalEWSUrl values as suggested in the link here:
http://blogs.msdn.com/b/mstehle/archive/2013/04/17/changes-in-managing-affinity-for-ews-subscriptions.aspx
I'm actually using a java library that handles all the soap calls so I don't have to worry about this side of things.
Many thanks
Terrie

Okay, if I change
"SubscribeToNotificationsOnAllFolders" back to "SubscribeToNotifications" then it doesn't error
out but it runs for about a second and I get the following table:
Id              Name State HasMoreData     Location
Command
33              fbe4a21a-8ad... NotStarted False
34              e903f16b-2b4... NotStarted False
$event.MessageData.Open()
Not sure what's going on here.

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