-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FdhXtPUSOvH7dEAa45mXMbCWhx/chwVaTa4mVp84inLk5eaMpL350ry4f00s7T0F
 W6Lf+haU358amDdac+aeHQ==

<SEC-DOCUMENT>0001012975-03-000217.txt : 20030725
<SEC-HEADER>0001012975-03-000217.hdr.sgml : 20030725
<ACCEPTANCE-DATETIME>20030725141915
ACCESSION NUMBER:		0001012975-03-000217
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030723
FILED AS OF DATE:		20030725

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MANGOSOFT INC
		CENTRAL INDEX KEY:			0000947969
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				870543565
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			0517

	BUSINESS ADDRESS:	
		STREET 1:		1500 W PARK DR
		STREET 2:		STE 190
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
		BUSINESS PHONE:		5088717300

	MAIL ADDRESS:	
		STREET 1:		1500 WEST PARK DRIVE
		STREET 2:		SUITE 190
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST AMERICAN CLOCK CO
		DATE OF NAME CHANGE:	19950712

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ZISES JAY
		CENTRAL INDEX KEY:			0001162316

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30781
		FILM NUMBER:		03803114

	BUSINESS ADDRESS:	
		STREET 1:		C/O PROSKAUER ROSE LLP
		STREET 2:		1585 BORADWAY
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		2129694412

	MAIL ADDRESS:	
		STREET 1:		C/O MANGOSOFT INC
		STREET 2:		1500 WEST PARK DRIVE STE 190
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4</documentType>

    <periodOfReport>2003-07-23</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000947969</issuerCik>
        <issuerName>MANGOSOFT INC</issuerName>
        <issuerTradingSymbol>MGOF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001162316</rptOwnerCik>
            <rptOwnerName>ZISES JAY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeSecurity>
        <securityTitle>
            <value>Series B Convertible Preferred Stock</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>0</value>
            <footnoteId id="F1"/>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-07-23</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>10000</value>
            </transactionShares>
            <transactionValue>
                <value>2.5</value>
                <footnoteId id="F3"/>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>1988-08-08</value>
            <footnoteId id="F2"/>
        </exerciseDate>
        <expirationDate>
            <value>1988-08-08</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>
    </derivativeSecurity>

    <footnotes>
        <footnote id="F1">1-for-1</footnote>
        <footnote id="F2">Immediately exercisable.</footnote>
        <footnote id="F3">Per share.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jay Zises</signatureName>
        <signatureDate>2003-07-23</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----