-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HCjfEfb4pIsFhtzB7z4fujrWfY83pIdksHkdc1iaxFkFKqPaIlskm19sP+cqGZui
 Ofs/ON99nH2ACISBgmxu4g==

<SEC-DOCUMENT>0001181431-09-018392.txt : 20090402
<SEC-HEADER>0001181431-09-018392.hdr.sgml : 20090402
<ACCEPTANCE-DATETIME>20090402112822
ACCESSION NUMBER:		0001181431-09-018392
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090331
FILED AS OF DATE:		20090402
DATE AS OF CHANGE:		20090402

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Benjamin O'Connell
		CENTRAL INDEX KEY:			0001419981

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20190
		FILM NUMBER:		09725946

	MAIL ADDRESS:	
		STREET 1:		AUTHENTIDATE HOLDING CORP.
		STREET 2:		300 CONNELL DRIVE, 5TH FLOOR
		CITY:			BERKELEY HEIGHTS
		STATE:			NJ
		ZIP:			07922

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:		CONNELL CORPORATE CENTER
		STREET 2:		300 CONNELL DRIVE, 5TH FLOOR
		CITY:			BERKELEY HEIGHTS
		STATE:			NJ
		ZIP:			07922
		BUSINESS PHONE:		9087871700

	MAIL ADDRESS:	
		STREET 1:		CONNELL CORPORATE CENTER
		STREET 2:		300 CONNELL DRIVE, 5TH FLOOR
		CITY:			BERKELEY HEIGHTS
		STATE:			NJ
		ZIP:			07922

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BITWISE DESIGNS INC
		DATE OF NAME CHANGE:	19930328
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd238956.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-03-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001419981</rptOwnerCik>
            <rptOwnerName>Benjamin O'Connell</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>AUTHENTIDATE HOLDING CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>300 CONNELL DRIVE, 5TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BERKELEY HEIGHTS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07922</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>185000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>50875</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>185000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ O'Connell Benjamin</signatureName>
        <signatureDate>2009-04-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----