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[MS-ASCMD]: ActiveSync Command Reference Protocol Specification

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2.2.2.19.2.1 Empty Sync Response<br />

The server sends a Sync response (section 2.2.2.19.2) with only HTTP headers, and no XML<br />

payload, if there are no pending server changes to report to the client. This Sync response is<br />

referred to as an empty Sync response. The client can respond to the empty Sync response with an<br />

empty Sync request (section 2.2.2.19.1) if there are no pending client changes and if the client is<br />

required to conserve bandwidth; otherwise, a Sync request with an XML payload can be sent. For<br />

more information about empty Sync requests, see section 2.2.2.19.1.1. For an example of an<br />

empty Sync request and response, see section 4.5.10.<br />

2.2.2.20 ValidateCert<br />

The ValidateCert command is used by the client to validate a certificate that has been received via<br />

an S/MIME mail.<br />

To validate a certificate, the server MUST verify that the certificate has not expired and has not been<br />

revoked. The server MUST walk up the certificate chain, verifying that each intermediate CA<br />

certificate has not expired and has not been revoked and that the root certificate is a trusted<br />

certificate authority (CA) (1). Certificate validation is particularly important for verifying<br />

signatures (for example, on S/MIME signed mail).<br />

The ValidateCert namespace is the primary namespace for this section. Elements referenced in this<br />

section that are not defined in the ValidateCert namespace use the namespace prefixes defined in<br />

section 2.2.1.<br />

[<strong>MS</strong>-<strong>ASCMD</strong>] — v20110315<br />

<strong>ActiveSync</strong> <strong>Command</strong> <strong>Reference</strong> <strong>Protocol</strong> <strong>Specification</strong><br />

Copyright © 2011 Microsoft Corporation.<br />

Release: Tuesday, March 15, 2011<br />

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