-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PfPhkCDKtdizwQIyz8H0QiAv6GFRs4bP52g+Rr4VXHA/4TZ4Zt/5FQf9UHhb86yr
 foWpMGN5guuVyL6O8bS+xA==

<SEC-DOCUMENT>0001012975-03-000359.txt : 20031121
<SEC-HEADER>0001012975-03-000359.hdr.sgml : 20031121
<ACCEPTANCE-DATETIME>20031121125739
ACCESSION NUMBER:		0001012975-03-000359
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031121
FILED AS OF DATE:		20031121

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:		031017396

	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>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-11-21</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>C/O ACAP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>767 THIRD AVENUE, 16TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2003-11-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>563</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.5</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>139</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote 1</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">By Nancy Zises as custodian for Meryl Shane Zises.</footnote>
    </footnotes>


    <ownerSignature>
        <signatureName>/s/ Jay Zises</signatureName>
        <signatureDate>2003-11-21</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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