I need to parse the content of an attachment on client record and look for a keyword. I am trying to do this in a after insert trigger on Attachment without success so far. The attachement is an outlook email saved as .msg file. 

Here is partial code. 

for (Attachment E : trigger.new) { 

String parentObj = E.ParentID;

blob attBody = EncodingUtil.base64Decode(E.Body.toString()) ;

String aContent = aBody.toString();

Wondering is it possible read contents of a .msg attachement. I was able to read text and csv attachments. 

I would really appreaciate some sample code or any other help on this.