Hmmm -- I've never had that happen personally; but generally speaking with third party application error messages I would try to clear any cached data (if that's an option) and then maybe uninstall/reinstall if that still wasn't helping. With Outlook specifically, I think it's also worth asking if you're using corporate email on your phone with any kind of security software? If there's some additional credential involved, and an uninstall/reinstall doesn't help, then I would try contacting your IT team to see if they have suggestions -- it might be an issue with something on the back end and not an Outlook problem!
Just checking in here to see how things are going. Did you still need any help with this?
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To find out whether or not the problem is due to your email server, try to open your email account through webmail then create a test email to send and receive through webmail. If you can successfully send and receive emails through webmail, it means that the problem is either on the Mail app or iOS device you are using. Otherwise, you’ll have to deal with email client or server issues first. If you have confirmed that the problem is not on your email server, then troubleshoot the Mail app and your iOS device.
- Turn off Sync Services in Preferences
- Quit Outlook and all other applications
- On the Apple menu, click Force Quit.
- Select an application in the "Force Quit Applications" window.Note: You cannot quit Finder.
- Click Force Quit.
- Drag OfficeSync Prefs to the Trash, and then close the window.
- On the Apple menu, click Restart.
- Open Outlook.
- On the Outlook menu, click Preferences.
- Under Other, click Sync Services.
- Select the check boxes for the items that you want to sync.
- Close the window.
- Back up Outlook identities
- Reset Microsoft Sync Services