An anonymous reader writes "A Microsoft server accesses URLs sent in Skype chat messages, even if they are HTTPS URLs and contain account information. A reader of Heise publications notified Heise Security. They replicated the observation by sending links via Skype, including one to a private file storage account, and found that these URLs are shortly after accessed from a Microsoft IP address. When confronted, Microsoft claimed that this is part of an effort to detect and filter spam and fishing URLs."
Link to Original Source