If the issue persists, please provide us with the following information: I understand sometimes the initial suggestion may not resolve the problem however, we can work together to narrow down and resolve the situation. In case you are using old, turn on new experience to see the difference. Once done, create a new mail merge doc in Word and select a data source, and this time, add only few recipients email addresses, finally finish and merge, check if the emails are still stuck in the Outbox.īesides, may I know if you are using new experience in Outlook? Please check if changing the experience in Outlook app makes any difference, if you are using new experience, please switch to New Outlook.

First delete all the email stuck in Outbox (for this, click the Outlook menu> Work Offline Click Outbox to display pending outgoing messages then delete the messages). To confirm, if the issue is with the mail merge process or the data source, let’s try sending a new mail merge with a small number of recipients in the data source. Usually, mail marge can’t be completed when there’s a data error in the data source table. Please check if all the email addresses in the source are correct.

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