how to reset office 365 outlook data file and start fresh

A deleted or disabled mailbox from the Exchange server.Outlook may fail to connect to the Exchange server due to various reasons, such as: Methods to Resolve Outlook Cannot Connect to Server Error.Why Outlook is Not Connecting to Server?.You must connect to Microsoft Exchange at least once before you can use your Outlook data file (.ost). However, when this authentication fails, Outlook cannot connect to the Exchange server mailbox and displays the following or similar error message.Ĭannot start Microsoft Outlook. Although Outlook OST file allows users to work even when the system is offline, it needs to authenticate the user profile by matching the MAPIEntryID GUID key with the server mailbox at least once to allow access to OST and Outlook profile. This OST file is encrypted with a unique MAPIEntryID GUID key, which is stored in the registry of your local system and Exchange server. Outlook, when configured with Exchange server profile in Cached Exchange Mode, creates an OST or Offline Folder file. In this guide, we’ve mentioned the reasons behind the error and the solutions to fix the 'Outlook cannot connect to server' error. The error occurs when authentication between Outlook and Exchange server fails due to corrupt profile, damaged or inaccessible OST file, synchronization issues, etc. *** the above assumes that this was the only account configured in your current profile.Outlook may fail to connect to the Exchange server due to several reasons. #7 - When done, be sure to set the newly created profile as the default for the next time Outlook is opened #6 - Configure the account with the appropriate details #1 - With Outlook closed, open the Control Panel app If you don't have any contact/calendar folders in the Yahoo folder tree in the Outlook Nav Pane, go straight to Step #8

*** before doing anything else, if you have contact/calendar folders with the words 'This Computer only' in the folder description and these folders have data you want to keep, you need to export that data to a PST file to ensure that you don t lose anything. There are different ways to achieve the same end but going to describe the approach which should be the simplest since you simply can't change an account from one type to another.

How to reset office 365 outlook data file and start fresh