Sending, receiving, and organizing email in Outlook on the web for business
For Outlook on the web, use the non-drag methods as the immediate workaround:
- To move an email, select the message, then use Move on the ribbon, or right-click the message and select Move or Copy to folder.
- If the destination folder is not shown, select Move to a different folder and choose it from the full folder list.
- To move multiple messages, select them first, then use the same Move action.
For attaching an email to another email in new Outlook, drag and drop is supported there by dragging the message into the message being composed until Drop messages here appears.
If the issue is specifically that drag-and-drop freezes the page in Outlook on the web, a documented workaround for move failures is to keep using Outlook on the web move commands instead of drag-and-drop. If the mailbox is hosted with a third party using IMAP or POP3, use that provider’s webmail to move items.