Microsoft has announced a major update to its iOS email and calendar app, Microsoft Outlook, bringing support for third-party add-ins, and celebrating two years since the release of an iOS adaptation of the company’s venerable e-mail client. The new add-ins feature allows users to integrate with third-party apps such as Trello, Evernote, and more directly from email messages in their Outlook inbox. Microsoft has announced partnerships with Evernote,…