I saw this issue in 3.0 but haven't seen it in 4.0. You can try this and see if it works. It worked for 3.0.
Always backup your registry before making changes. Also, you should update your client to Rollup 5 if you are able.
1.
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Click Start, click Run, type regedit in the Open box, and then click OK.
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2.
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Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_SUBDOWNLOAD_LOCKDOWN
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3.
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Right-click Outlook.exe, and then click Modify.
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4.
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In the Value data box, type 0, and then click OK.
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5.
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Exit Registry Editor.
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Best Regards,
Donna