Have you seen where remnants of old devices caused connection issues? If so, do you know why it happens?Well, I think its either a bug or an intended requirement of Exchange server obligating its manager to perform cleanings of old devices. Either way, this has been a constant brain teaser for all iPhone/Exchange users from contacts to calendars to email. I can imagine its a pain to sort out, but the suggestions I provided appear to be most common responses in EE and on Apple's support site.
We are looking at the load. We also run through both TMG and Radware load balancers (external vs internal). I was thinking someone may have seen the log I posted and knew of some configuration problem or exactly what the "was pending" meant.I recommend Request Attention for this. That is over my head heh. :)
1.
If you have used the same credentials on another phone prior to the iPhone, they are probably still cached in the Exchange server, and the default number of devices allowed by Exchange Server is 10, some organizations make that fewer.If you have access to the Exchange/Outlook Web Access: log in and go to Options > See All Options > Phone.
You should see a list of devices that have been setup with that email account, delete any unneeded ones.
2.
Also, if active sync is not enabled connection will not also establish from phone to server. Try to remove the account from the device and then restart and reconfigure the account.You can open up the EMC (Exchange Management Console).
Go to Recipient Configuration > Mailbox
Right-click the Mailbox for the user and select properties
Click on Mailbox Features Tab
Should be able to see everything that is enabled for the user (POP, MAPI, Archive, OWA, ActiveSync)
Source
Let us know if that works or not. :)