Hi shylaja,
Welcome to the Monastery.
To read msg files from a particular folder, you need to open the folder see opendir, then open each msg file in the folder to read.
Are the msg files just plain text files or not? You didn't say.
You can also look at using glob.
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Once again welcome.

Thanks for your reply 2teez. msg files are outlook files. It has only plain text in the body of the mail. I need to read the body of each msg file. The module Email::Outlook::Message can be used if I am trying to read mail in the outlook. But the mails will be saved in a folder and I need to retrieve the body of mails from the directory. open function will not open the msg files for reading the body of the mail.

..The module Email::Outlook::Message can be used if I am trying to read mail in the outlook. But the mails will be saved in a folder..
Email::Outlook::Message, also parse mail when you are not reading from your Outlook mail directly. i.e with your mails saved in a folder on your local drive.
E.g:

#!/usr/bin/perl -Wl
use strict;

use Email::Outlook::Message;

for my $filename ( glob("$ARGV[0]*") ) {

    ## tell the filename reading
    print 'Filename: ', $filename;

    my $msg  = new Email::Outlook::Message $filename;
    my $mime = $msg->to_email_mime;
    print $mime->as_string;
}
[download]

NOTE: I didn't link the Email::Outlook::Message, I only outlined it here. Others in this thread had it linked already.
And of course, your folder which contain these msg files must be the given from the CLI.
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Hello shylaja, and welcome to the Monastery!

If your “msg” files are email messages created with Microsoft Outlook (see http://www.wikihow.com/Open-MSG-Files), you can parse them with the module Email::Outlook::Message. Caveat: I haven’t used this module myself.

Hope that helps,

By 'folder' do you mean directory or a folder within Microsoft Outlook? Super Search will find you many threads discussing this problem.