Having many folders with many messages in Microsoft Outlook, especially if they have attachments, can be slow. This issue is because Microsoft Outlook downloads all messages every time including attachments versus a normal email IMAP application where only headers are synced to present crucial information only, and messages and attachments are ONLY downloaded and cached upon viewing the message or if the mail application is explicitly told to download all messages. Continue reading Outlook Hangs when Synchronizing Subscribed Folders