[MS-ASCMD]: ActiveSync Command Reference Protocol Specification

airsync:WindowSize element (section 2.2.3.172) that specifies the number of items to be
synchronized at a time.
If more items remain to be synchronized, the airsync:MoreAvailable element (section 2.2.3.99) is
returned in the Sync command response. The client then continues to call the Sync command until
no more items are available. For more details about the airsync:WindowSize element of the Sync
command, see section 2.2.3.172.
After a full synchronization has been performed on a collection, successive synchronizations are
used to obtain additions, deletions, or changes to the initial collection state. The client can use the
Sync command request to add, delete, or change items on the server, and the server can use the
Sync command response to add, delete, or change items on the client.
The following table lists the command sequence for folder synchronization.
The asterisk (*) in the Order column means that the step can be repeated multiple times. [n] means
that a step is optional.
Order Client action Server action
1 The client sends the Sync command for the
Email, Calendar, Contacts, and/or Tasks
collection with a synchronization key of
zero (0). This establishes a partnership with
the server, initializing server data for the
device.
2* The client sends the Sync command with a
synchronization key of zero (0) for other
collections to be synchronized.
[3] The client sends the GetItemEstimate
command for all collections to be
synchronized. This step can be skipped if it
is not required by the client UI.
4* The client sends the Sync command with
the airsync:GetChanges element for a
collection. The command SHOULD include
the airsync:WindowSize element, the
recommended value for which is 100.
This step is repeated for each collection to
be synchronized or all collections can be
combined into one request.
The server responds with the synchronization key
for the collection, to be used in successive
synchronizations.
The server responds with new synchronization
keys for each collection.
The server responds to indicate how many items
will be added, changed, or deleted, for each
collection.
The server responds with airsync:Add (section
2.2.3.7.2), airsync:Change (section 2.2.3.23),
or airsync:Delete (section 2.2.3.40.2) elements
for items in the collection. If the response
contains the airsync:MoreAvailable element,
this step is repeated.
The client can use the airsync:WindowSize element to break the server airsync:Add elements
into multiple sets of items. The recommended window size is 100. For more details about the
airsync:WindowSize element used by the Sync command, see section 2.2.3.172.
3.1.5.5 Receiving and Accepting Meeting Requests
This section specifies how the client retrieves items from the Inbox folder by using the Sync
command (section 2.2.2.19), responds to a meeting request item by using the MeetingResponse
command (section 2.2.2.9), and synchronizes the Calendar folder by using the Sync command so
that the new Calendar object is added to the client's calendar.
A meeting request is returned by the server in response to a synchronization of the Inbox folder. A
meeting request is an e-mail message that has an embedded calendar item. The message contains
[MS-ASCMD] — v20110315
ActiveSync Command Reference Protocol Specification
Copyright © 2011 Microsoft Corporation.
Release: Tuesday, March 15, 2011
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