Outlook 2016 updating conflicts
Luckily, Office includes a repair utility to fix common problems with the suite of apps.To repair the installation, close any running Office application, and do the following: Once you've completed the steps, the repair tool will do a clean reinstallation of Office, and after the process, you should be able to use the Outlook 2016 app normally without issues.
For instance, when you have the Inbox folder of 2 different mailboxes added as a Favorite.
For Outlook 2007 and Outlook 2010, changing the display name of the IMAP mailbox is the same as for any other pst-file: As mentioned, the display name of an Exchange mailbox can’t be changed directly within Outlook.
Also, the display name of an IMAP mailbox in Outlook 2013, 2016, 2019 and Office 365 can’t be set separately from the display name of the account.
If after repairing the installation, you're still experiencing problems, then it could be something wrong with the Outlook data files.
Outlook 2016 uses two types of data files, including the Offline Outlook File (.ost) and the Outlook Data File (.pst), depending on the type of account you configured to store offline copies of your emails, contacts, calendars, and other items.
For instance, when you set the delivery for multiple POP3 accounts to a single pst-file, it doesn’t make sense that the pst-file in Outlook is named after the email address of only 1 account.