Client/Protocol Breakdown

In early 2017, Microsoft began deprecating the use and support of EAS in Outlook for Windows. However, EAS is still the industry standard for synchronizing mobile devices. In addition, Microsoft has ended support for Sharepoint Sync outside of its use with Microsoft 365 (Office). As a result, customers currently using either of these for synchronizing their accounts to Outlook for Windows should move to one of the supported protocols below.

It's worth noting, some clients show features as being Not Available (n/a). This is not a limitation of SmarterMail. The protocol simply doesn't support that particular feature for that client or the client itself lacks that feature. In addition, there are many more clients and applications available for email, calendars, contacts and more across all operating systems -- too many to list and provide complete capabilities. WebDAV is listed as it's the overall protocol which covers calDAV, cardDAV, etc.

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 (Calendars, Contacts, Tasks, Notes)	MAPI	MAPI	MAPI	EWS	n/a
Delegation	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
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