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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 FGFs+yy0NAUMYWVvizzl1V8FFkZejoveX1nH28pF+HDGXA0tZytZSbJpuwcafHYR
 1dohum01Bt4IoQX1Kxmc+A==

<SEC-DOCUMENT>0001181431-06-051268.txt : 20060905
<SEC-HEADER>0001181431-06-051268.hdr.sgml : 20060904
<ACCEPTANCE-DATETIME>20060905210842
ACCESSION NUMBER:		0001181431-06-051268
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060901
FILED AS OF DATE:		20060905
DATE AS OF CHANGE:		20060905

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AUTHENTIDATE HOLDING CORP
		CENTRAL INDEX KEY:			0000885074
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				141673067
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		2165 TECHNOLOGY DRIVE
		CITY:			SCHENECTADY
		STATE:			NY
		ZIP:			12308
		BUSINESS PHONE:		5183467799

	MAIL ADDRESS:	
		STREET 1:		2165 TECHNOLOGY DRIVE
		CITY:			SCHENECTADY
		STATE:			NY
		ZIP:			12308

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BITWISE DESIGNS INC
		DATE OF NAME CHANGE:	19930328

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SHERIDAN J EDWARD
		CENTRAL INDEX KEY:			0001197478

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20190
		FILM NUMBER:		061075268

	MAIL ADDRESS:	
		STREET 1:		2165 TECHNOLOGY DRIVE
		CITY:			SCHENECTADY
		STATE:			NY
		ZIP:			12308
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd129533.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-09-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000885074</issuerCik>
        <issuerName>AUTHENTIDATE HOLDING CORP</issuerName>
        <issuerTradingSymbol>ADAT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001197478</rptOwnerCik>
            <rptOwnerName>SHERIDAN J EDWARD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>AUTHENTIDATE HOLDING CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>300 CONNELL DRIVE, FIFTH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BERKELEY HEIGHTS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07922</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Director Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.03</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-09-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2006-09-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2011-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <ownerSignature>
        <signatureName>/s/ J. Edward Sheridan</signatureName>
        <signatureDate>2006-09-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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