Web.config Doubts While Working With Legacy Application

Coding with ASP.NET 2.0 C# on a legacy application. The database is in MySQL I would like to know whether anything breaks if I delete the following lines from my code

First <xhtmlConformance mode="Strict"/>
Then,
<compilers>
<compiler language="c#"
type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"
extension=".cs"
compilerOptions="/d:DEBUG;trACE"/>
</compilers>
And last,
<browserCaps>
<case match="^Mozilla/5.0 ([^)]*) (Gecko/[-d]+)(?'VendorProductToken' (?'type'[^/d]*)([d]*)/(?'version'(?'major'd+)(?'minor'.d+)(?'letters'w*)))?">
browser=Gecko
<filter>
<case match="(Gecko/[-d]+)(?'VendorProductToken' (?'type'[^/d]*)([d]*)/(?'version'(?'major'd+)(?'minor'.d+)(?'letters'w*)))">
type=${type}
</case>
<case>
<!-- plain Mozilla if no VendorProductToken found -->
type=Mozilla
</case>
</filter>
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
<case match="rv:(?'version'(?'major'd+)(?'minor'.d+)(?'letters'w*))">
version=${version}
majorversion=0${major}
minorversion=0${minor}
<case match="^b" with="${letters}">
beta=true
</case>
</case>
</case>
<!-- AppleWebKit Based Browsers (Safari...) //-->
<case match="AppleWebKit/(?'version'(?'major'd?)(?'minor'd{2})(?'letters'w*)?)">
browser=AppleWebKit
version=${version}
majorversion=0${major}
minorversion=0.${minor}
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
<case match="AppleWebKit/(?'version'(?'major'd)(?'minor'd+)(?'letters'w*))(.* )?(?'type'[^/d]*)/.*( |$)">
type=${type}
</case>
</case>
<!-- Konqueror //-->
<case match=".+[K|k]onqueror/(?'version'(?'major'd+)(?'minor'(.[d])*)(?'letters'[^;]*));s+(?'platform'[^;)]*)(;|))">
browser=Konqueror
version=${version}
majorversion=0${major}
minorversion=0${minor}
platform=${platform}
type=Konqueror
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
</case>
<!-- Opera //-->
<case match="Opera[ /](?'version'(?'major'd+)(?'minor'.(?'minorint'd+))(?'letters'w*))">
<filter match="[7-9]" with="${major}">
tagwriter=System.Web.UI.HtmlTextWriter
</filter>
<filter>
<case match="7" with="${major}">
<filter>
<case match="[5-9]" with="${minorint}">
ecmascriptversion=1.5
</case>
<case>
ecmascriptversion=1.4
</case>
</filter>
</case>
<case match="[8-9]" with="${major}">
ecmascriptversion=1.5
</case>
</filter>
</case>
</browserCaps>

I believe they all are not needed. Are they needed at all at present? What I would really like to know is whether anything breaks if I delete them. I would also like to know whether the snippet given below is relevant for ASP.NET 2.0

<sessionState mode="InProc"
stateConnectionString="tcpip=127.0.0.1:42424"
sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false"
timeout="100"/>

when my application is using MySQL as database and authentication mode is windows.