Note: Imported contacts (for example, contacts from a connected account) aren't synced across devices and apps. Your information is always up to date in Outlook and on the server that hosts your mailbox. When you use an account in Outlook, your e-mail messages, contacts, calendar events, tasks, and notes are synchronized automatically. accounts are hosted on an Exchange server. Your information is always up to date in Outlook and on the server that is running Microsoft Exchange Server. When you use a Microsoft Exchange account in Outlook, your e-mail messages, contacts, calendar events, and any other Microsoft Exchange folders are synchronized automatically. The descriptions below provide details about how Outlook syncs information. Outlook also syncs regularly with Microsoft Exchange account accounts and e-mail accounts. You can sync your Outlook data with mobile devices and with other applications. Outlook 2016 Outlook 2016 for Mac Outlook for Mac 2011 Outlook Mail for Windows 10 Outlook on the web for Exchange Server 2016 More.