Zimbra Active Sync

Using a Zimbra 9 Mail Server that has the Zextras Active Sync plugin. Not EWS. How do I get this to work? I see that your stance is that Active Sync is a mobile device product only, which is not the case. Active Sync in this case is server-side.

There are NO EWS pages published from Zimbra. Just the Active Sync connector. So how can I get eM client to work properly?


eM Client doesn’t support plugins so wouldn’t work even if it’s on the Zimbra server. Also as you said eM Client supports EWS & not EAS for the desktop client.

There was a post reply from Russel Markosky (eM Client support) in a thread about eM Client Active sync support.



Oct '20
Hello Randy,

The protocol itself (ActiveSync) was primarily created to work on mobile devices and this would cause problems on the desktop app while, for example, moving messages between normal (IMAP/EWS) accounts and the ActiveSync account. On top of that, the royalty fee that is charged by Microsoft for each installation is unfortunately incompatible with our FREE license.

We tried to convince the Zimbra team to support the well-designed Exchange protocol but they refused to do so.

Best regards,

Hi Russel,

I’m new to eM Client but not to Zimbra (15+ years experience). Zimbra Network Edition does support EWS with the right license and the EWS feature turned on, and yesterday I set up eM Client version 9.2.1796 (6a0aa35) on my late 2021 M1 MacBook Pro successfully; syncs were happening seemingly OK.

This morning, I noticed the yellow triangle containing an exclamation point, although eM Client continues to sync emails just fine. Looking in /opt/zimbra/log/mailbox.log I see errors like:

2023-04-27 10:14:33,039 WARN [qtp1381713434-846242] [[email protected];oip=xxx.xxx.xxx.xxx;port=46506;ua=**eMClient**/(ExchangeServicesClient/);] PhaseInterceptorChain - Application {http://schemas.microsoft.com/exchange/services/2006/messages}ExchangeService#{http://schemas.microsoft.com/exchange/services/2006/messages}GetUserConfiguration has thrown exception, unwinding now

2023-04-27 10:14:47,044 WARN [Docs WOPI] [[email protected];oip=xxx.xxx.xxx.xxx;port=46970;ua=**eMClient**/(ExchangeServicesClient/);] PhaseInterceptorChain - Application {http://schemas.microsoft.com/exchange/services/2006/messages}ExchangeService#{http://schemas.microsoft.com/exchange/services/2006/messages}GetUserConfiguration has thrown exception, unwinding now

This is on Zimbra 8.8.15 Patch 39.

I’ve opened a Support Case with Zimbra, but if you have any insights, I would be grateful.