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I would like to clarify the following details to further narrow down the problem:
1. Check if you can synchronize any calendar options (like meetings and appointment) in Outlook Web App and Outlook on your laptop.
2. Check if you have more than one account in your Outlook.
Based on my knowledge, once you add your Exchange Online account to your device (ActiveSync) and Outlook Desktop client, your email should synchronize between Exchange Online and your mobile device / Outlook client.
In your situation, you may have added multiple accounts in your Outlook client and performed actions on the alternative account, this caused synchronization problem to Exchange Online (and your device).
1 out of 1 people found this post helpful.
Yes. I had to reinstall and restart the computer but everything is fine now. Phone, laptop & web are all in sync. Thank you.