Client/Protocol Breakdown

In early 2017, Microsoft began deprecating the use and support of Exchange ActiveSync (EAS) in Outlook for Windows. However, EAS remains the industry standard for synchronizing mobile devices. Additionally, Microsoft has discontinued support for SharePoint Sync outside of Microsoft 365 (Office). As a result, users currently relying on these protocols for Outlook synchronization should transition to one of the supported alternatives listed below.

It’s important to note that some email clients may display certain features as Not Available (N/A). This is not a limitation of SmarterMail for Windows and Linux but rather a restriction of the protocol itself or the client lacking that specific functionality. Furthermore, numerous email, calendar, and contact management applications exist across all operating systems, far too many to list individually. WebDAV is included as it encompasses CalDAV for calendar sync, CardDAV for contact management, and other essential collaboration features.

For optimal email hosting, secure communication, and seamless synchronization across Windows, Linux, and mobile devices, SmarterMail supports multiple industry-standard protocols, ensuring maximum compatibility and performance.

Windows Desktop Clients

Feature	Outlook 2021	Outlook 2019	Outlook 2016	eM Client+	Windows Mail*
Email Folders	MAPI	MAPI	MAPI	EWS	EAS
Contacts	MAPI	MAPI	MAPI	EWS/WebDAV	EAS
Delegation	MAPI	MAPI	MAPI	EWS	n/a
Contact Groups	MAPI	MAPI	MAPI	EWS	n/a
GAL**	MAPI	MAPI	MAPI	EWS	EAS
Primary Calendar	MAPI	MAPI	MAPI	EWS/WebDAV	EAS
Secondary Calendar	MAPI	MAPI	MAPI	EWS	EAS
Tasks	MAPI	MAPI	MAPI	EWS/WebDAV	n/a
Notes	MAPI	MAPI	n/a	EWS/WebDAV	n/a
Shared Folders	MAPI	MAPI	MAPI	EWS	IMAP
Shared Contacts	MAPI	MAPI	MAPI	EWS	n/a
Shared Calendars	MAPI	MAPI	MAPI	EWS	n/a
Shared Tasks	MAPI	MAPI	MAPI	EWS	n/a
Shared Notes	MAPI	MAPI	MAPI	EWS	n/a
Room Scheduling	MAPI	MAPI	MAPI	EWS	n/a
Contact Groups	MAPI	MAPI	MAPI	EWS	n/a
Public Folders	MAPI	MAPI	MAPI	EWS	n/a
Synced Categories	MAPI	MAPI	MAPI	EWS	n/a
Autodiscover	MAPI	MAPI	MAPI	EWS	EAS

*Includes People and Calendar applications for Windows 10
^**GAL works on search and/or autocomplete only
⁺Some features require a Pro license of eM Client

MacOS Desktop Clients

Feature	Outlook 2019	Mac Mail*
Email Folders	EWS	EWS
Contacts	EWS	EWS/WebDAV
Delegation	EWS	n/a
Contact Groups**	n/a	n/a
GAL	EWS	EWS
Primary Calendar	EWS	EWS
Secondary Calendar	EWS	EWS
Tasks	EWS	n/a
Notes	EWS	EWS
Shared Folders	EWS	n/a
Shared Contacts	EWS	n/a
Shared Calendars	EWS	n/a
Shared Tasks	EWS	n/a
Shared Notes	EWS	n/a
Domain Calendars	EWS	n/a
Public Folders	EWS	n/a
Synced Categories	EWS	n/a
Autodiscover	EWS	EWS

*Includes Calendar, Contacts and Notes applications for MacOS
**Contact Groups in Outlook for Mac and Apple Mail are not supported due to limitations of the clients.

Mobile Clients

Feature	iOS Mail*	Gmail (Android)	Samsung Mail**	Outlook (iOS/Android)***
Email Folders	EAS	EAS	EAS	EAS
Contacts	EAS/WebDAV	EAS/WebDAV	EAS/WebDAV	EAS
GAL	EAS	EAS	EAS	EAS
Primary Calendar	EAS	EAS	EAS	EAS
Secondary Calendar	EAS	EAS	EAS	EAS
Tasks	EAS	n/a	EAS	n/a
Notes	EAS	n/a	n/a	n/a
Shared Folders	EAS	EAS	EAS	EAS
Shared Contacts	EAS	n/a	EAS	n/a
Shared Calendars	EAS	EAS	n/a	n/a
Shared Tasks	EAS	n/a	EAS	n/a
Shared Notes	EAS	n/a	n/a	n/a
Domain Calendars	n/a	n/a	n/a	n/a
Synced Categories	n/a	n/a	EAS	n/a
Autodiscover	EAS	n/a	EAS	EAS

*Includes iOS Calendar, Contacts, Reminders and Notes apps
**Includes Samsung Calendar and Contacts apps
***SmarterMail supports EAS 16.1, but Outlook mobile uses EAS 14, so some features are not available in Outlook mobile