What exactly do you mean with "outline"?
Do you mean specific a border color different from the fill color of bars?
This works in SP1 and an example for this is attached below.
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<?xml version="1.0" encoding="utf-8"?>
<Report
xmlns="
http://schemas.microsoft.com/sqlserver/reporting/2003/10/reportdefini tion"
xmlns:rd="
http://schemas.microsoft.com/SQLServer/reporting/reportdesigner"> <RightMargin>1in</RightMargin>
<Body>
<ReportItems>
<Chart Name="newChart1">
<ThreeDProperties>
<Rotation>30</Rotation>
<Inclination>20</Inclination>
<Shading>Real</Shading>
<WallThickness>25</WallThickness>
<DrawingStyle>Cylinder</DrawingStyle>
<Clustered>true</Clustered>
</ThreeDProperties>
<Style>
<BorderStyle>
<Default>Solid</Default>
</BorderStyle>
<Color>Firebrick</Color>
</Style>
<Legend>
<Visible>true</Visible>
<Style>
<BorderStyle>
<Default>Solid</Default>
</BorderStyle>
</Style>
<Position>RightCenter</Position>
</Legend>
<Palette>Excel</Palette>
<ChartData>
<ChartSeries>
<DataPoints>
<DataPoint>
<DataValues>
<DataValue>
<Value>=Fields!UnitsInStock.Value</Value>
</DataValue>
</DataValues>
<DataLabel>
<Style />
</DataLabel>
<Style>
<BackgroundColor>Blue</BackgroundColor>
<BorderWidth>
<Default>1.5pt</Default>
</BorderWidth>
<BorderColor>
<Default>Yellow</Default>
</BorderColor>
<BorderStyle>
<Default>Solid</Default>
</BorderStyle>
</Style>
<Marker>
<Size>6pt</Size>
</Marker>
</DataPoint>
</DataPoints>
</ChartSeries>
</ChartData>
<CategoryAxis>
<Axis>
<Title>
<Caption>Products</Caption>
<Style />
</Title>
<Style>
<FontSize>8pt</FontSize>
</Style>
<MajorGridLines>
<Style>
<BorderWidth>
<Default>1.5pt</Default>
</BorderWidth>
<BorderStyle>
<Default>Solid</Default>
</BorderStyle>
</Style>
</MajorGridLines>
<MinorGridLines>
<ShowGridLines>true</ShowGridLines>
<Style>
<BorderStyle>
<Default>Dotted</Default>
</BorderStyle>
</Style>
</MinorGridLines>
<MajorTickMarks>Outside</MajorTickMarks>
<MinorTickMarks>Outside</MinorTickMarks>
<MajorInterval>5</MajorInterval>
<MinorInterval>1</MinorInterval>
<CrossAt>0</CrossAt>
<Margin>true</Margin>
<Visible>true</Visible>
</Axis>
</CategoryAxis>
<DataSetName>Northwind</DataSetName>
<PointWidth>55</PointWidth>
<Type>Column</Type>
<Top>0.25in</Top>
<Title>
<Style>
<BorderStyle>
<Default>Solid</Default>
</BorderStyle>
</Style>
</Title>
<Width>6.375in</Width>
<CategoryGroupings>
<CategoryGrouping>
<DynamicCategories>
<Grouping Name="newChart1_CategoryGroup2">
<GroupExpressions>
<GroupExpression>=Fields!CategoryName.Value</GroupExpression>
</GroupExpressions>
</Grouping>
<Label />
</DynamicCategories>
</CategoryGrouping>
<CategoryGrouping>
<DynamicCategories>
<Grouping Name="CategoryGroup1">
<GroupExpressions>
<GroupExpression>=Fields!ProductName.Value</GroupExpression>
</GroupExpressions>
</Grouping>
<Label>=Fields!ProductName.Value</Label>
</DynamicCategories>
</CategoryGrouping>
</CategoryGroupings>
<Height>3.25in</Height>
<SeriesGroupings>
<SeriesGrouping>
<StaticSeries>
<StaticMember>
<Label>Stock</Label>
</StaticMember>
</StaticSeries>
</SeriesGrouping>
</SeriesGroupings>
<Subtype>Plain</Subtype>
<PlotArea>
<Style>
<BackgroundColor>OldLace</BackgroundColor>
</Style>
</PlotArea>
<Left>0.25in</Left>
<ValueAxis>
<Axis>
<Title>
<Caption>Amount</Caption>
<Style />
</Title>
<Style>
<BorderColor>
<Default>IndianRed</Default>
</BorderColor>
<FontSize>8pt</FontSize>
</Style>
<MajorGridLines>
<ShowGridLines>true</ShowGridLines>
<Style>
<BorderColor>
<Default>Blue</Default>
</BorderColor>
<BorderStyle>
<Default>Dashed</Default>
</BorderStyle>
</Style>
</MajorGridLines>
<MinorGridLines>
<ShowGridLines>true</ShowGridLines>
<Style>
<BorderColor>
<Default>CornflowerBlue</Default>
</BorderColor>
<BorderStyle>
<Default>Dotted</Default>
</BorderStyle>
</Style>
</MinorGridLines>
<MinorTickMarks>Cross</MinorTickMarks>
<Min>0</Min>
<MajorInterval>20</MajorInterval>
<MinorInterval>5</MinorInterval>
<Interlaced>true</Interlaced>
<Margin>true</Margin>
<Visible>true</Visible>
<Scalar>true</Scalar>
</Axis>
</ValueAxis>
</Chart>
</ReportItems>
<Style />
<Height>3.625in</Height>
</Body>
<TopMargin>1in</TopMargin>
<DataSources>
<DataSource Name="Northwind">
<rd:DataSourceID>32d95cbf-5e5b-4fb3-a37a-39b9506b8c80</rd:DataSourceID>
<ConnectionProperties>
<DataProvider>SQL</DataProvider>