You can use this web.config file directly on the root folder in order to host the WordPress website in the IIS Server. This web.config for WordPress does all the stuffs. I will be explaining the content in this file, if you want the detailed knowledge.
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<defaultDocument>
<files>
<clear />
<add value="index.php" />
</files>
</defaultDocument>
<rewrite>
<rules>
<clear />
<rule name="WordPress Rule" stopProcessing="true">
<match url=".*" />
<conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<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>
<outboundRules>
<clear />
</outboundRules>
</rewrite>
</system.webServer>
</configuration>