1. A method comprising: examining a first attachment in a first message of a user; examining a second attachment in a second message of the user, wherein the first attachment is different from the second attachment; comparing the first attachment to the second attachment to determine if the attachments are related by determining a similarity score for the first and second attachments; and if the comparing determines that the attachments are related based upon a comparison of the similarity score and a similarity threshold, notifying the user that a collaboration may be occurring.