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REST API is not yet supported for this mailbox

When installing the Office add-in, you get the following error:

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REST API is not yet supported for this mailbox

This usually indicates that the mailbox you are trying to use the Office add-in with is located on an on-premise Exchange server. In this case, you might need to install the add-in via the Exchange Admin Center.

We do recommend to look into the COM add-in though, as it’s working much better with Exchange.

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