Exchange Online synchronizes connected accounts every hour. This means that messages from a connected account are downloaded to Outlook Web App every hour. Currently, there's no method to change the synchronization interval for connected accounts.�
The Connected Accounts feature in Outlook Web App lets users connect up to five other accounts, such as Outlook.com, Gmail, and Yahoo! Mail accounts. This lets users send, receive, and read mail from the accounts in one place. For more information,�go to the following Microsoft websites:
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