<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-06-22</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001095600</issuerCik>
        <issuerName>BLUE COAT SYSTEMS INC</issuerName>
        <issuerTradingSymbol>BCSI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333356</rptOwnerCik>
            <rptOwnerName>Francisco Partners II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001368029</rptOwnerCik>
            <rptOwnerName>Francisco Partners GP II, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001368028</rptOwnerCik>
            <rptOwnerName>Francisco Partners GP II Management, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001196198</rptOwnerCik>
            <rptOwnerName>GEESLIN KEITH</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001367782</rptOwnerCik>
            <rptOwnerName>SEQUOIA CAPITAL GROWTH FUND III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001367781</rptOwnerCik>
            <rptOwnerName>SEQUOIA CAPITAL GROWTH PARTNERS III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001357260</rptOwnerCik>
            <rptOwnerName>SEQUOIA CAPITAL GROWTH III PRINCIPALS FUND</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001367787</rptOwnerCik>
            <rptOwnerName>SCGF III MANAGEMENT LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2882 SAND HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock, par value $0.0001 per share</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.525</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, par value $0.0001 per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1420313</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock, par value $0.0001 per share</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.525</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, par value $0.0001 per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19686</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock, par value $0.0001 per share</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.525</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, par value $0.0001 per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>905677</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock, par value $0.0001 per share</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.525</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, par value $0.0001 per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9985</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock, par value $0.0001 per share</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.525</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, par value $0.0001 per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>44336</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series A Preferred Stock is convertible at any time at the holders' election. The conversion rights do not expire.</footnote>
        <footnote id="F2">The reported securities are owned directly by Francisco Partners II, L.P. (&quot;Francisco Partners II&quot;) and indirectly by Francisco Partners GP II, L.P. (&quot;Francisco Partners GP II&quot;), as general partner of Francisco Partners II, Francisco Partners GP II Management, LLC (&quot;Francisco Partners Management&quot;), as general partner of Francisco Partners GP II, and Keith Geeslin, a limited partner of Francisco Partners GP II and a managing member of Francisco Partners Management.  Pursuant to Rule 16a-1, Francisco Partners GP II, Francisco Partners Management and Keith Geeslin disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.</footnote>
        <footnote id="F3">The reported securities are owned directly by Francisco Partners Parallel Fund II, L.P. (&quot;Francisco Partners Parallel Fund&quot;) and indirectly by Francisco Partners GP II, as general partner of Francisco Partners Parallel Fund, Francisco Partners Management, as general partner of Francisco Partners GP II, and Keith Geeslin, a limited partner of Francisco Partners GP II and a managing member of Francisco Partners Management.  Pursuant to Rule 16a-1, Francisco Partners GP II, Francisco Partners Management and Keith Geeslin disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.</footnote>
        <footnote id="F4">The reported securities are owned directly by Sequoia Growth Fund III (&quot;Sequoia Growth Fund&quot;) and indirectly by SCGF III Management, LLC (&quot;SCGF Management&quot;), as general partner of Sequoia Growth Fund.  Pursuant to Rule 16a-1, SCGF Management disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interests therein.</footnote>
        <footnote id="F5">The reported securities are owned directly by Sequoia Growth Partners III (&quot;Sequoia Growth Partners&quot;) and indirectly by SCGF Management, as general partner of Sequoia Growth Partners.  Pursuant to Rule 16a-1, SCGF Management disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interests therein.</footnote>
        <footnote id="F6">The reported securities are owned directly by Sequoia Growth III Principals Fund (&quot;Sequoia Growth Principals Fund&quot;) and indirectly by SCGF Management, as general partner of Sequoia Growth Principals Fund.  Pursuant to Rule 16a-1, SCGF Management disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interests therein.</footnote>
    </footnotes>

    <remarks>This report is filed jointly by Francisco Partners, Francisco Partners Parallel Fund II, Francisco Partners GP II, Francisco Partners Management, Keith Geeslin, Sequoia Growth Fund, Sequoia Growth Partners, Sequoia Growth Principals Fund and SCGF Management. Francisco Partners II, Francisco Partners Parallel Fund, Sequoia Growth Fund, Sequoia Growth Partners and Sequoia Growth Principals Fund (together, the &quot;Investors&quot;) may each be deemed a director by deputization by virtue of their right to nominate a representative to serve on the board of directors of Blue Coat Systems, Inc. (&quot;Blue Coat&quot;).  Keith Geeslin serves as the Investors' representative on Blue Coat's board of directors. Francisco Partners II, Francisco Partners Parallel Fund, Francisco Partners GP II, Francisco Partners Management, Sequoia Growth Fund, Sequoia Growth Partners, Sequoia Growth Principals Fund and SCGF Management may each be deemed a member of a Section 13(d) group that owns, upon conversion of the Series A Preferred Stock into Common Stock, more than 10% of Blue Coat's outstanding Common Stock.</remarks>

    <ownerSignature>
        <signatureName>/s/ KEITH GEESLIN</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FRANCISCO PARTNERS II, L.P.: By: Francisco Partners GP II, L.P., General Partner: By: Francisco Partners GP II Management, LLC, General Partner: By: /s/ KEITH GEESLIN: Keith Geeslin, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FRANCISCO PARTNERS PARALLEL FUND II, L.P.: By: Francisco Partners GP II, L.P., General Partner: By: Francisco Partners GP II Management, LLC, General Partner: By: /s/ KEITH GEESLIN: Keith Geeslin, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FRANCISCO PARTNERS GP II, L.P.: By: Francisco Partners GP II Management, LLC, General Partner: By: /s/ KEITH GEESLIN: Keith Geeslin, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>FRANCISCO PARTNERS GP II MANAGEMENT, LLC: By: /s/ KEITH GEESLIN: Keith Geeslin, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SEQUOIA CAPITAL GROWTH FUND III: By: SCGF III Management, LLC, General Partner: By: /s/ JIM GOETZ: Jim Goetz, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SEQUOIA CAPITAL GROWTH PARTNERS III: By: SCGF III Management, LLC, General Partner: By: /s/ JIM GOETZ: Jim Goetz, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SEQUOIA CAPITAL GROWTH III PRINCIPALS FUND: By: SCGF III Management, LLC, General Partner: By: /s/ JIM GOETZ: Jim Goetz, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SCGF III MANAGEMENT, LLC: By: /s/ JIM GOETZ: Jim Goetz, Managing Member</signatureName>
        <signatureDate>2006-06-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
