Exchange ActiveSync is an Exchange synchronization protocol that's optimized to work together with high-latency and low-bandwidth networks. The protocol, based on HTTP and XML, lets mobile phones access an organization's information on a server that's running Microsoft Exchange.

You can control which mobile devices can synchronize with Exchange Server. You do this by monitoring new mobile devices as they connect to your organization or by setting up rules that determine which types of mobile devices are allowed to connect. Regardless of the method you choose to specify which mobile devices can synchronize, you can approve or deny access for any specific mobile device for a specific user at any time.


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ActiveSync is a mobile data synchronization app developed by Microsoft, originally released in 1996. It synchronizes data with handheld devices and desktop computers. In the Windows Task Manager, the associated process is called wcescomm.exe.

On desktops, ActiveSync synchronizes emails, calendar, contacts and tasks with Microsoft Outlook, along with Internet bookmarks and files. ActiveSync does not support all features of Outlook. For instance, contacts grouped into subfolders are not transferred. Only the contacts which are not in a subfolder are synchronized. In case of Exchange Server, only emails, calendar, contacts and tasks may be synchronized.

Supported mobile devices include PDAs or smartphones running Windows Mobile, Windows CE,[1] BlackBerry 10 or iOS but not the older BlackBerry versions, Palm OS and Symbian platforms. Windows Phone 7 doesn't support desktop ActiveSync synchronization.[2]

The value of this element is a dateTime data type in Coordinated Universal Time (UTC) format. The time portion of the dateTime value might be 11:59 and SHOULD be ignored, so that synchronizing between different time zones does not change the date.


Users of iOS 8.3 devices may experience issues in which changes to calendar items may not be synchronized to their mailbox. This causes the updates to be unavailable in Outlook or Outlook Web App (OWA). These issues were diagnosed as requiring changes to the iOS implementation of the Microsoft Exchange ActiveSync protocol.


For more information, go to the following article in the Microsoft Knowledge Base:

When a user syncs a mailbox by using an iOS device, the calendar on the device may be missing one or more appointments. These appointments are available when you view the calendar from Outlook or OWA. There may also be duplicate instances of the appointment in the calendar if the appointment is accepted from the device.


For more information, go to the following article in the Microsoft Knowledge Base:

When a user syncs a mailbox by using an iOS device, and a recurring meeting is scheduled to occur on the 31st of every month, the meeting does not appear on the device for those months that do not have 31 days.


Cause


iOS does not honor the 31st-day recurrence pattern in the way that Outlook does. When a month does not have 31 days, Outlook displays the recurring meeting in the calendar on the last day of the month. However, iOS displays only those occurrences that land exactly on the 31st day. This behavior also occurs with recurring meetings for the 29th-day and 30th-day recurrence patterns.


If this issue is not resolved by applying the iOS update, customers should remove the calendar from the list of folders to synchronize, wait several minutes, and then add the calendar back to the list of folders to synchronize.

When a user synchronize their iOS or Android device by using Exchange ActiveSync, they may unexpectedly become the organizer for a meeting to which they were invited. This does not change the meeting for all attendees.


This issue can occur if you change the reminder for a single occurrence of a recurring meeting on an iOS or Android device. There may be other changes to meeting items that cause the same problem.


Current issues (Exchange Online, Exchange 2016, Exchange 2013, Exchange 2010 and Exchange 2007)

Recent issues that have similar symptoms have been reported to Microsoft. These issues can affect users on all versions of Exchange Server. Currently, Microsoft cannot reduce the effect of these new issues. We encourage users to work with their device vendors to find a solution to the problem.

Assume that you synchronize your iOS device by using Exchange ActiveSync on an Exchange Server 2007 mailbox. If the organizer cancels a single occurrence of a recurring meeting, the device may unexpectedly delete the whole recurring meeting.Solution


Follow these steps:


A user cannot synchronize his or her iOS device with a mailbox that is hosted on Exchange Server 2010 or Exchange Server 2013 after the iOS device is upgraded to iOS 7.0.


Solution


Exchange Server 2013


To resolve this issue in Exchange Server 2013, install the update that is described in the following article in the Microsoft Knowledge Base:


2859928 Description of Cumulative Update 2 for Exchange Server 2013


Exchange Server 2010


To resolve this issue in Exchange Server 2010, install the update rollup that is described in the following article in the Microsoft Knowledge Base:


2866475 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 3


Note Microsoft has documented the problem in the following article in the Microsoft Knowledge Base:


2851708 Cannot synchronize an Exchange mailbox after updating an Apple iOS device to iOS 7.0

You may experience resource exhaustion issues that are caused by devices that connect by using Exchange ActiveSync.


Solution


Administrators should review the following article in the Microsoft Knowledge Base to determine whether the users are experiencing the same server symptoms:


2469722 Unable to connect using Exchange ActiveSync due to Exchange resource consumption


Note This article also describes a known issue that occurs after you update to iOS 4.0. For more information, go to the iOS 4.0: Exchange Mail, Contacts, or Calendars may not sync after update website. We also discuss this issue in Issue 2.5 later in this section.


Exchange 2007 administrators should determine whether they are experiencing the same server symptoms.



IT administrators should also review Issue 1.8 in the previous section.


Another possible avenue to investigate is whether the device is continuously re-synchronizing. Apple has documented the behavior in the following article:


If you get timeout errors with Exchange accounts on iPhone, iPad, or iPod touch

Exchange ActiveSync policies can cause provisioning and synchronization to fail when devices are customized. Devices are not provisioned if a policy that exceeds these limitations is applied to the users of these devices.


Solution


Updates to the Android OS version seem to resolve this problem. We encourage device users to update to the latest version that is available from their provider and to follow vendor forums that discuss synchronization issues. If the decision is made to use older devices in the organization, administrators can canvass device users or use tools such as Log Parser or Export-ActiveSyncLog to make sure that such devices are identified in the organization. Users of older devices can be grouped into a policy that can work for them.

Microsoft ActiveSync 4.5 is the latest sync software release for Windows Mobile-based devices. ActiveSync provides a great synchronization experience with Windows-based PCs and Microsoft Outlook right out of the box. ActiveSync acts as the gateway between your Windows-based PC and Windows Mobile-based device, enabling the transfer of Outlook information, Office documents, pictures, music, videos and applications to and from your device. In addition to synchronizing with a desktop PC, ActiveSync can synchronize directly with Microsoft Exchange Server 2003 so that you can keep your e-mail, calendar data, tasks and contact information updated wirelessly when youre away from your PC. ActiveSync 4.5 supports PC sync via USB cable, Bluetooth, or infrared connection.

Hi guys i have a few questions, 

1) Currently was reading the manual guides

 -guides/u_e-autodiscover_config/

saying that activesync should not be used with desktop client? are they saying should not be used on outlook?

2) When installing on outlook which i need to sync calendar and contacts i choose 

active sync -outlook/#outlook-2013-or-higher-on-windows-active-sync-not-recommended

but reading it says its not recommend? any ideas why? when testing out seems everything good ff782bc1db

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