Member name	Value	Description
Sync	5	The Sync element is a required element in Sync command requests and responses that identifies the body of the HTTP POST as containing a Sync command (section 2.2.2.19). It is the top-level element in the XML stream.
Responses	6	Contains responses to operations that are processed by the server.
Add	7	Creates a new object in a collection on the client or on the server.
Change	8	Modifies properties of an existing object on the client device or the server.
Delete	9	Deletes an object on the client device or the server. The object is identified by its ServerId element.
Fetch	10	Used to request the application data of an item that was truncated in a synchronization response from the server.
SyncKey	11	Contains a value that is used by the server to mark the synchronization state of a collection.
ClientId	12	Contains a unique identifier (typically an integer) that is generated by the client to temporarily identify a new object that is being created by using the Add element.
ServerId	13	It represents a unique identifier that is assigned by the server to each object that can be synchronized.
Status	14	Indicates the reason for the failure of a command request.
Collection	15	Contains commands and options that apply to a particular collection.
Class	16	Identifies the class of the item being added to the collection.
CollectionId	18	Specifies the server ID of the folder to be synchronized.
GetChanges	19	Requests that the server include in its response any pending changes to the collection that is specified by the ServerId element (section 2.2.3.151.6).
MoreAvailable	20	Indicates there are more changes than the number that are requested in the WindowSize element (section 2.2.3.183).
WindowSize	21	Specifies a maximum number of changed items in a collection or a request that SHOULD be included in the synchronization response.
Commands	22	Contains operations that apply to a collection.
Options	23	Contains elements that control certain aspects of how the synchronization is performed.
FilterType	24	Specifies an optional time window for the objects that are sent from the server to the client. It applies to email and calendar collections.
Conflict	27	Specifies how to resolve the conflict that occurs when an object has been changed on both the client and the server.
Collections	28	Serves as a container for the Collection element.
ApplicationData	29	Contains data for a particular object, such as a contact, email message, calendar appointment, or task item. Can be used to change items, add items, or fetch items on the client device or server.
DeletesAsMoves	30	Indicates that any deleted items SHOULD be moved to the Deleted Items folder.
Supported	32	Specifies which contact and calendar elements in a Sync request are managed by the client.
SoftDelete	33	Deletes an object from the client when it falls outside the FilterType (section 2.2.3.64.2) results or it is no longer included as part of the SyncOptions (section 2.2.3.115.5) instructions.
MIMESupport	34	Enables MIME support for email items that are sent from the server to the client.
MIMETruncation	35	Specifies whether the MIME data of the email item SHOULD be truncated when it is sent from the server to the client.
Wait	36	Specifies the number of minutes that the server SHOULD delay a response if no new items are added to the included folders, as specified in section 3.1.5.4.
Limit	37	Specifies either the maximum number of collections that can be synchronized or the maximum/minimum value that is allowed for the Wait interval (section 2.2.3.182) or HeartbeatInterval interval (section 2.2.3.79.2).
Partial	38	Indicates to the server that the client sent a partial list of collections, in which case the server obtains the rest of the collections from its cache.
ConversationMode	39	Specifies whether to include items that are included within the conversation modality within the results of the Sync response.
MaxItems	40	Specifies the maximum number of recipients (that is, the top N most frequently used recipients) to keep synchronized from within the recipient information cache.
HeartbeatInterval	41	Specifies the number of seconds that the server SHOULD delay a response if no new items are added to the included folders, as specified in section 3.1.5.4.

Reference

Aspose.Email.Clients.ActiveSync.TransportLayer Namespace