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  <rr:RiskReturnHeading contextRef="CTXT_P0001S000037168member_S000037168member">Emerging Markets External Debt Portfolio</rr:RiskReturnHeading>
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  <rr:ExpenseHeading contextRef="CTXT_P0001S000037168member_S000037168member">The first paragraph in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses&amp;quot; is hereby deleted and replaced with the following:  &amp;nbsp;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="CTXT_P0001S000037168member_S000037168member">&lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none"&gt;&lt;font style=&apos;font-size:10.0pt;font-family:"Times New Roman","serif"&apos;&gt;The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value (&amp;quot;NAV&amp;quot;) of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the &amp;quot;Fund&amp;quot;) or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to the Class H. More information about these and other discounts is available from your financial adviser and in the &amp;quot;Shareholder Information&#8212;How To Purchase Class P and Class H Shares&amp;quot; section on page 12 of this Prospectus.&lt;/font&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:10.0pt;line-height:115%;font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;"&gt;&amp;nbsp;&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="CTXT_P0001S000037168member_S000037168member">The following replaces the &amp;quot;Shareholder Fees&amp;quot; table and related footnote thereto with respect to Class P and Class H shares only in section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses:&amp;quot;  &amp;nbsp;</rr:ShareholderFeesCaption>
  <rr:OtherExpensesNewFundBasedOnEstimates contextRef="CTXT_P0001S000037168member_S000037168member">Other expenses have been estimated for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
  <rr:OperatingExpensesCaption contextRef="CTXT_P0001S000037168member_S000037168member">The following replaces the &amp;quot;Annual Portfolio Operating Expenses&amp;quot; table and related footnotes thereto with respect to Class L shares only in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses&#8212;Annual Portfolio Operating Expenses:&amp;quot;  &amp;nbsp;</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="CTXT_P0001S000037168member_S000037168member">The following table replaces the &amp;quot;Example&amp;quot; table with respect to Class P, Class H and Class L shares only in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Example::  &amp;nbsp;</rr:ExpenseExampleHeading>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="S000037168member_C000114464member" unitRef="Ratio" decimals="4">0.0425</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="S000037168member_C000114465member" unitRef="Ratio" decimals="4">0.0400</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
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  <rr:ManagementFeesOverAssets contextRef="S000037168member_C000114466member" unitRef="Ratio" decimals="4">0.0075</rr:ManagementFeesOverAssets>
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  <rr:ExpenseExampleYear01 contextRef="S000037168member_C000114464member" unitRef="USD" decimals="0">532</rr:ExpenseExampleYear01>
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  <rr:ExpenseExampleYear01 contextRef="S000037168member_C000114465member" unitRef="USD" decimals="0">508</rr:ExpenseExampleYear01>
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  <rr:RiskReturnHeading contextRef="CTXT_P0001S000037169member_S000037169member">Total Emerging Markets Portfolio</rr:RiskReturnHeading>
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  <rr:ExpenseBreakpointDiscounts contextRef="CTXT_P0001S000037169member_S000037169member">For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value (&amp;quot;NAV&amp;quot;) of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the &amp;quot;Fund&amp;quot;) or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to the Class H.</rr:ExpenseBreakpointDiscounts>
  <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="CTXT_P0001S000037169member_S000037169member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
  <rr:ExpenseHeading contextRef="CTXT_P0001S000037169member_S000037169member">The first paragraph in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses&amp;quot; is hereby deleted and replaced with the following:  &amp;nbsp;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="CTXT_P0001S000037169member_S000037169member">&lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none"&gt;&lt;font style=&apos;font-size:10.0pt;font-family:"Times New Roman","serif"&apos;&gt;The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value (&amp;quot;NAV&amp;quot;) of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the &amp;quot;Fund&amp;quot;) or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to the Class H. More information about these and other discounts is available from your financial adviser and in the &amp;quot;Shareholder Information&#8212;How To Purchase Class P and Class H Shares&amp;quot; section on page 16 of this Prospectus.&lt;/font&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:10.0pt;line-height:115%;font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;"&gt;&amp;nbsp;&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="CTXT_P0001S000037169member_S000037169member">The following table replaces the &amp;quot;Shareholder Fees&amp;quot; table with respect to Class P shares only in section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses:&amp;quot;  &amp;nbsp;</rr:ShareholderFeesCaption>
  <rr:ExpenseExampleHeading contextRef="CTXT_P0001S000037169member_S000037169member">The following table replaces the &amp;quot;Example&amp;quot; table with respect to Class P shares only in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Example:&amp;quot;  &amp;nbsp;</rr:ExpenseExampleHeading>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="S000037169member_C000114468member" unitRef="Ratio" decimals="4">0.0525</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:RedemptionFeeOverRedemption contextRef="S000037169member_C000114468member" unitRef="Ratio" decimals="4">-0.0200</rr:RedemptionFeeOverRedemption>
  <rr:ShareholderFeesTableTextBlock contextRef="CTXT_P0001S000037169member_S000037169member">&lt;div&gt; &amp;lt;div style="display:none;" &amp;gt;~ http://www.morganstanley.com/20130114/role/ShareholderFeesData_P0001-S000037169Member row primary compact * row dei_LegalEntityAxis compact ck0000836487_S000037169Member column rr_ProspectusShareClassAxis compact * column dei_LegalEntityAxis compact ck0000836487_S000037169Member ~&amp;lt;/div&amp;gt; &lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:ExpenseExampleYear01 contextRef="S000037169member_C000114468member" unitRef="USD" decimals="0">679</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="S000037169member_C000114468member" unitRef="USD" decimals="0">1003</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="CTXT_P0001S000037169member_S000037169member">&lt;div&gt; &amp;lt;div style="display:none;" &amp;gt;~ http://www.morganstanley.com/20130114/role/ExpenseExample_P0001-S000037169Member row primary compact * row dei_LegalEntityAxis compact ck0000836487_S000037169Member column rr_ProspectusShareClassAxis compact * column dei_LegalEntityAxis compact ck0000836487_S000037169Member ~&amp;lt;/div&amp;gt; &lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:RiskReturnHeading contextRef="CTXT_P0001S000037170member_S000037170member">Multi-Asset Portfolio</rr:RiskReturnHeading>
  <ck0000836487:SupplementTextBlock contextRef="CTXT_P0001S000037170member_S000037170member">&lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none"&gt;&lt;b&gt;&lt;font style=&apos;font-size:9.0pt;font-family:"Arial","sans-serif"&apos;&gt;Prospectus Supplement&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:21.0pt;margin-right:0in;margin-bottom: 0in;margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace: none"&gt;&lt;b&gt;&lt;font style=&apos;font-size:9.0pt;font-family:"Arial","sans-serif"&apos;&gt;January 14, 2013&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:21.0pt;margin-right:0in;margin-bottom: 0in;margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace: none"&gt;&lt;font style=&apos;font-size:18.0pt;font-family:"Arial","sans-serif"&apos;&gt;Morgan Stanley Institutional Fund, Inc.&lt;/font&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none"&gt;&lt;font style=&apos;font-size:8.0pt;font-family:"Arial","sans-serif"&apos;&gt;Supplement dated January 14, 2013 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated May 23, 2012 of:&lt;/font&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:14.0pt;margin-right:0in;margin-bottom: 0in;margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace: none"&gt;&lt;b&gt;&lt;font style=&apos;font-size:8.0pt;font-family:"Arial","sans-serif"&apos;&gt;Multi-Asset Portfolio&lt;br /&gt; (the &amp;quot;Portfolio&amp;quot;)&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:10.0pt;line-height:115%;font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;"&gt;&amp;nbsp;&lt;/p&gt;</ck0000836487:SupplementTextBlock>
  <rr:ExpenseBreakpointDiscounts contextRef="CTXT_P0001S000037170member_S000037170member">For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value (&amp;quot;NAV&amp;quot;) of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the &amp;quot;Fund&amp;quot;) or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to the Class H.</rr:ExpenseBreakpointDiscounts>
  <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="CTXT_P0001S000037170member_S000037170member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
  <rr:ExpenseHeading contextRef="CTXT_P0001S000037170member_S000037170member">The first paragraph in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses&amp;quot; is hereby deleted and replaced with the following:  &amp;nbsp;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="CTXT_P0001S000037170member_S000037170member">&lt;p class="MsoNormal" style="font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none"&gt;&lt;font style=&apos;font-size:10.0pt;font-family:"Times New Roman","serif"&apos;&gt;The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value (&amp;quot;NAV&amp;quot;) of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the &amp;quot;Fund&amp;quot;) or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to the Class H. More information about these and other discounts is available from your financial adviser and in the &amp;quot;Shareholder Information&#8212;How To Purchase Class P and Class H Shares&amp;quot; section on page 14 of this Prospectus.&lt;/font&gt;&lt;/p&gt;  &lt;p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:10.0pt;line-height:115%;font-size:11.0pt;font-family:&apos;calibri&apos;,&apos;sans-serif&apos;;"&gt;&amp;nbsp;&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="CTXT_P0001S000037170member_S000037170member">The following table replaces the &amp;quot;Shareholder Fees&amp;quot; table with respect to Class P shares only in section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Fees and Expenses:&amp;quot;  &amp;nbsp;</rr:ShareholderFeesCaption>
  <rr:ExpenseExampleHeading contextRef="CTXT_P0001S000037170member_S000037170member">The following table replaces the &amp;quot;Example&amp;quot; table with respect to Class P shares only in the section of the Prospectus entitled &amp;quot;Portfolio Summary&#8212;Example:&amp;quot;  &amp;nbsp;</rr:ExpenseExampleHeading>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="S000037170member_C000114471member" unitRef="Ratio" decimals="4">0.0525</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:ShareholderFeesTableTextBlock contextRef="CTXT_P0001S000037170member_S000037170member">&lt;div&gt; &amp;lt;div style="display:none;" &amp;gt;~ http://www.morganstanley.com/20130114/role/ShareholderFeesData_P0001-S000037170Member row primary compact * row dei_LegalEntityAxis compact ck0000836487_S000037170Member column rr_ProspectusShareClassAxis compact * column dei_LegalEntityAxis compact ck0000836487_S000037170Member ~&amp;lt;/div&amp;gt; &lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:ExpenseExampleYear01 contextRef="S000037170member_C000114471member" unitRef="USD" decimals="0">655</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="S000037170member_C000114471member" unitRef="USD" decimals="0">930</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="CTXT_P0001S000037170member_S000037170member">&lt;div&gt; &amp;lt;div style="display:none;" &amp;gt;~ http://www.morganstanley.com/20130114/role/ExpenseExample_P0001-S000037170Member row primary compact * row dei_LegalEntityAxis compact ck0000836487_S000037170Member column rr_ProspectusShareClassAxis compact * column dei_LegalEntityAxis compact ck0000836487_S000037170Member ~&amp;lt;/div&amp;gt; &lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:footnote xlink:type="resource" xlink:label="footnote_1000" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US">The Board of Directors approved an amendment to the Distribution and Shareholder Services Plan reducing the distribution and shareholder services (12b-1) fee for the Portfolio&#8217;s Class L shares from 0.75% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Service (12b-1) Fees shown in the table above have been restated to reflect such change.</link:footnote>
    <link:loc xlink:type="locator" xlink:href="#id_footnote_1000" xlink:label="DistributionAndService12b1FeesOverAssets_1001" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="DistributionAndService12b1FeesOverAssets_1001" xlink:to="footnote_1000" order="1.0" />
    <link:footnote xlink:type="resource" xlink:label="footnote_1001" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US">Other expenses have been estimated for the current fiscal year.</link:footnote>
    <link:loc xlink:type="locator" xlink:href="#id_footnote_1001" xlink:label="OtherExpensesOverAssets_1002" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="OtherExpensesOverAssets_1002" xlink:to="footnote_1001" order="1.0" />
    <link:footnote xlink:type="resource" xlink:label="footnote_1002" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US">The Portfolio&#8217;s "Adviser," Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Portfolio so that Total Annual Portfolio Operating Expenses, excluding certain investment related expenses, will not exceed 0.85% for Class I, 1.10% for Class P, 1.10% for Class H and 1.35% for Class L. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund&#8217;s Board of Directors acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.</link:footnote>
    <link:loc xlink:type="locator" xlink:href="#id_footnote_1002" xlink:label="ExpensesOverAssets_1003" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ExpensesOverAssets_1003" xlink:to="footnote_1002" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#id_footnote_1003" xlink:label="FeeWaiverOrReimbursementOverAssets_1004" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_1004" xlink:to="footnote_1002" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#id_footnote_1004" xlink:label="NetExpensesOverAssets_1005" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="NetExpensesOverAssets_1005" xlink:to="footnote_1002" order="1.0" />
  </link:footnoteLink>
</xbrl>
