Windows Mail app using EAS (Exchange ActiveSync)

Windows Mail app using EAS (Exchange ActiveSync)

   KB 21639        Last updated on 2015-07-11  

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Windows Mail app using EAS (Exchange ActiveSync) is available in ZCS 8.5 or above and is a Network Edition feature.

Preparing the COS and checking your license

To use the EAS feature Windows Mail app, you need to have a Mobile Sync Accounts in the Zimbra License. You can check your license with the command:

   zimbra@zimbra-sn-u14-10:~$ zmlicense -p | grep MobileSync*                                

If you have a valid license and enough accounts to configure it, enable the Mobile sync in the COS that you want under Home > Configure > Class of Service > YOURCOS > Zimbra Mobile


Configuring your account in the Windows Mail app

Be sure that you are using Microsoft 8 or above, as the EAS feature will not work in Windows 7 or earlier.

Click the Start Button and click the Mail Icon and search for the Feature called Mail


Then click on the left corner, and select Settings


In the Settings section, click Accounts to create the new account


You will see your Hotmail account, required in Windows 10, click now in Add an Account


From all the different type of accounts, select Exchange to configure Zimbra with EAS.


If the Autodiscover feature is properly configured, just introduce here your Email and your Password.


In the Autodiscover feature is not configured, you need to introduce all the information manually.

  • Email address - Your business email address.
  • Server address - Usually is the same URL like the WebClient, (
  • Domain - The domain of your Company, (
  • Username - Your username, usually is the first part of the email address, like, the username will be user
  • Password - The password from your business email.


In case that uses a Self-Signed certificate, and you do not have the valid CA and the SSL certificate installed on the Computer, will prompt this warning. The best option is have a valid Commercial SSL certificate.


The wizard will finish and will ask to follow the policies that the server has.


Test the synchronization between the Mail app and the WebClient

Once the Profile is configured, just click in the Mail app icon

Once opened, confirm that you have all the items synchronized between the WebClient and the Mail app.


Note: You are not able to check Shared Items for other users, such as Mail folders, calendars, etc. If you want to do this, you need to install and configure the ZCO and use Microsoft Outlook 2010 or above


Using the Contacts, you will have all the Contacts synchronized between the Mail app and the WebClient.



Zimbra with an account in EAS can synchronize the Calendar too, here is the example and appointment created on the Mail App.


Advantages of still using the ZCO with a Microsoft Outlook 2010 and above

Zimbra Connector for Outlook (ZCO) has more options than a configuration with Outlook and EAS, with ZCO you can:

  • have the Out-of-Office Synced
  • see and manage Shared Items: Mail folders, Calendars, Adress Books, etc.
  • have the same rules in Webclient and also in Outlook with ZCO
  • all the signatures will sync, some users have different signatures with "template emails"
  • Outlook with ZCO permits import a .PST from other Outlook versions or previous backup

Identified Support/Known Issues

Known issues include the following bugs:


  • [Bug 83727] - Contacts sub-folders and Global Address List do not sync when using an Outlook 2013 Exchange ActiveSync profile.
  • [Bug 83736] - Read receipt notifications are not received when enabled when using an Outlook 2013 Exchange ActiveSync profile.
  • [Bug 83747] - Categories and Tags are not displaying in the Zimbra Web Client when using Outlook 2013 Exchange ActiveSync.
  • [Bug 83750] - Appointment and tasks display in HTML body format in Outlook 2013 Exchange ActiveSync.
  • [Bug 83790] - Contact notes do not display in the Zimbra Web Client when using Outlook 2013 Exchange ActiveSync.
  • [Bug 83793] - Task reminders in the Zimbra Web Client do not sync when using Outlook 2013 Exchange ActiveSync.
  • [Bug 83801] - Numerous known issues when using Outlook 2013 Exchange ActiveSync.
Verified Against: ZCS 8.6, 8.5, 8.0 Date Created: 04/01/2014
Article ID: Date Modified: 2015-07-11

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