Description:
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I use the SendMail() from the php.net (->alex@bartl.net). Till now it works fine, but now i updated the webserver to IIS5 on Win2k from IIS4 on NT4, and now the base64 encoding seems to work wrong (HTML and Attachment part). The SMTP Server is Linux. Mail will received with Outlook.
I tried already to change the charset from iso-8859-1 to utf-8, but it doesn't becomes better.

This problem i got only with Win2k/IIS5!

Reproduce code:
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$TEXT="Hallo, this a test for my email program. Hallo, this a test for 
my email program. ....long text with breaks ....
test for my email program. Hallo, this a test for my email program.";
$HTML=false;

if (SendMail(
    "phpmailer@definiens.com","PHP Apache Webmailer",         //sender
    "topitz@definiens.com","Tiberius Opitz",     //recipient
    "Testmail",                               //subject
    $TEXT,$HTML,$ATTM)) echo "Mail send successfull.";

function SendMail($From,$FromName,$To,$ToName,$Subject,$Text,$Html,$AttmFiles){
... see php.net
}

Expected result:
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the script should send a mail with multipart data (text/html/attachment) and print a success message after sending.

Actual result:
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I got the email abreviated, but with additional characters (wrong decoded)like: ܈^H[XZ[??ܘ[K?O...
I've the same problem with attechments.