"You don't have the permissions required to send messages" error message when you use Outlook Web App to reply to a message from an account that you connected to Office 365 pre-upgrade

When you use the light version of Microsoft Outlook Web App (OWA) to reply to an email message from an email account that you connected to Microsoft Office 365 pre-upgrade, you receive the following error message:Additionally, the From field isn't present when you compose a new message or reply to a message.

To resolve this issue, click to clear the Use the blind and low vision experience check box in OWA. To do this, follow these steps.

• Office 365 for enterprises pre-upgrade: Software requirements for Office 365
• Office 365 for professionals and small businesses pre-upgrade: Software requirements for Office 365

1. Sign in to OWA, and then click Options in the upper-right area of the page.
2. In the left navigation pane, click Accessibility.
3. Click to clear the Use the blind and low vision experience check box, and then click Save.
   
4. Sign out of OWA.
5. Sign back in to OWA, reply to a message that's received from a connected account, and then verify that the issue is resolved.

This occurs because the light version of Outlook Web App isn't supported when you reply to a message from a connected account. When you reply to a message from the connected account by using the light version of OWA, OWA tries to send as the default Office 365 pre-upgrade email address.

If the Always Show From option is selected in the message options or from the Exchange Control Panel mail settings, the From field is displayed when you compose a new message or reply to a message from a connected account. However, the From field isn't displayed when you use OWA in the light version regardless of this setting.

The light version of OWA is optimized to support users who are blind or have low vision and supports older web browsers. For more info about the light version of OWA, go to the following Microsoft website:

Still need help? Go to the Office 365 Community website.