With both accounts open in Outlook, go to your UTmail+ account and select messages you wish to copy to the other account. Note: do not select too many, because it might cause the process to crash. Keep it at around 50 messages at a time.
Right-click or hold down the control key and left-click on the selected messages to pop out a menu.
Go down to Move and select Copy to Folder. Note: we recommend copying rather than moving to ensure nothing goes wrong and the messages end up getting lost, which has been known to happen.
In the window that opens, either choose the folder from the list, or begin to type in the name of the folder for the other account in the search field to bring up that folder. Note: It is probably a good idea to create a new empty folder in the other account to copy these messages to.
Click Copy to have the messages duplicated in the new account. Continue going through these steps until all messages are copied.
Copy Contacts
In Contact view, select the Contacts you want to copy and while holding down the option key, drag them to the Contacts for the other account.
Confirm the copy by clicking Import.
Copy Calendar Items
Note: Calendar items on Outlook for Mac can only be moved and only one at a time.
Select the item and right-click or control click to pop up a menu. Choose Move > Choose Folder.
Choose the calendar you wish to move it to and click OK.