Folder connection limit

Hi there!
I recognized a strange behavior when using JavaMail. Most likely it is due to a usage error by me but maybe you can help me to fix it. I'm connecting through JavaMail 1.4.2 to an Exchange server (2007). Then I try to open as much folders as possible (just to test the Exchange behavior). When the first exception is raised, I save the amount of open folders and close them afterwards.
This is the code:
IMAPFolder[] list = new IMAPFolder[100];
int amount = 0;
for (int i=0; i<100; i++) {
try {
    list[i] = (IMAPFolder) eStore.getFolder("inbox");
    list.open(Folder.READ_ONLY);
} catch (Exception e) {
amount = i;
break;
for (int i=0; i<100; i++) {
if (list[i] != null)
if (list[i].isOpen())
list[i].close(false);
list[i] = null;
System.out.println(amount + " open folders allowed.");
Okay, now to the strange thing: I activated the debug option in JavaMail and I saw that it establishes a new server connection (!!!) when calling eStore.getFolder("inbox"). Is that the supposed behavior? I performed the connection establishment before manually. So why does have JavaMail to reestablish it? This is the point where I think I misuse JavaMail. But in the demo source files it is written in the way above, too.
The second thing is when I try to close the open folders I get the following notification: IMAP DEBUG: IMAPProtocol noop
A4 NOOP
A4 OK NOOP completed.
DEBUG: current size: 1 pool size: 1
DEBUG: pool is full, not adding an Authenticated connection
A5 LOGOUT
* BYE Microsoft Exchange Server 2007 IMAP4 server signing off.When performing the first close() operation, it closes the folder. But for all folders afterwards, I get the message shown above.
And last but not least: how do I increase the number of parallel open folders? It is set to 15 but I would need a higher number.

Okay. Thanks for the fast answers.
I just noticed that my Exchange guys have reduced the amount of concurrent IMAP connections. This broke my application because I was monitoring each subfolder of inbox with an IDLE command. Maybe you could think about changing the JavaMail structure to support better the IDLE command. But I think the problem is located in the IMAP protocol. If the IDLE command really needs an open connection to the folder then there is no other way around.
Anyway, thanks for you help bshannon.

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http://technet.microsoft.com/en-us/library/cc753521.aspx#BKMK_interface
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http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/854f3e27-10e5-4629-bb77-007cc5e42b41
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http://blogs.msdn.com/b/david.wang/archive/2006/04/12/howto-maximize-the-number-of-concurrent-connections-to-iis6.aspx
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