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Each version has added new and improved features. The outlook desktop application has been around for years and has seen many iterations. OWA does not download any local copies so it can show you everything in the mailbox since its creation. This is only a cap on cached email, a simple clicking “see more email on the server” will reveal all. To prevent it reaching the maximum capacity too quickly there will be a cap on how far back your email history will be in the Outlook application, usually six months. These local copies are stored in a single file which has a size limit of 50GB. The desktop version of Outlook uses a feature called cached exchange mode which means it downloads a copy of your emails to the machine. There is no chance of missing the message arrival as you don’t need to wait for the application to sync and download a copy to your machine. There is no delay between an email arriving in your inbox and being able to read it. By connecting to Outlook in the browser you get direct access to the mail server and as a result will see your entire mailbox in real time. Simply go to and log in with your email address and password. Once logged in, you’ll be able to send and receive emails as normal, as well as many more features. Reaching OWA only requires a web browser which means it can be used on any operating system including macOS. Outlook Web Access (OWA) provides access to your Office 365 mailbox without the use of a dedicated mail application like Outlook.
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