Phones are actually running into a provisioning issue against Exchange 2010 Server.

Now, let me list some related details here for everyone's information. The only verified solution that we know of at this moment has come thru this community, as 'Mitch Roberson' has writtenīelow, I have marked that as an 'Answer' as well. This is a known issue with certain versions of Android OS on phones available from different manufacturers and service providers. This seems to be a generic error with the HTC though as does not really identify the issue. Please try again later.' when trying to sync. On the HTC device, it accepts the mailbox credentials then comes up with 'Failed to create the account. so there is nothing wrong with the mailbox settings. I can access my mailbox via ActiveSync using Seems like it no longer fully supports my device for some reason. It then quatantined the connecting iPhones and iPads, but still blocked the HTC at the user mailbox level (it never went to the Quarantined Devices at all). I tried changing the default AcvtiveSync Access setting in ECP to Quarantine All Devices. Our default policy applies to my mailbox, which is to allow all devices, not require password etc etc. HTC gets immediately Denied Access (shown in the IIS logs and also under the user mailbox, Phone and Voice features, ActiveSync in ECP). OWA is fine and ActiveSync is still working fine with iPhones and iPads. (Have not updated the mailbox servers yet). It worked on this firmware until I updated our 2 CAS servers to Exchange 2010 sp1. which is meant to be updated for improved Exchange server support. Had my HTC Desire (which shows up as Bravo) ActiveSync all working fine with Exchange 2010.

Microsoft activesync for htc