Ekleipsis

Just had this happen to a client’s site today. If you are using a Windows IIS webserver this should do the trick.

Using IIS 7.x with the MS URL Rewriter installed (http://www.iis.net/downloads/microsoft/url-rewrite)
And PHP for your site running in FastCGI mode.

Then you need your web.config file in your site’s home directory to contain these details:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
      <rules><rule name="Main Rule" stopProcessing="true"><match url=".*"/><conditions logicalGrouping="MatchAll"><add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true"/><add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true"/></conditions><action type="Rewrite" url="index.php"/></rule>
				<rule name="wordpress" patternSyntax="Wildcard">
					<match url="*"/>
						<conditions>
							<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true"/>
							<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true"/>
						</conditions>
					<action type="Rewrite" url="index.php"/>
				</rule></rules>
    </rewrite>
		<httpErrors errorMode="Detailed" />
    </system.webServer>
</configuration>

If you are still using IIS6 then a similar solution will work but you would need a Third Pary URL rewriting ISAPI module for the functionality usually given with Apache/ModRewrite in .htaccess

Hope it Helps