office 365 mail not connecting with outlook client

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. Methods to Resolve Outlook Cannot Connect to Server Error.Why Outlook is Not Connecting to Server?.MySQL Toolkit3-in-1 software toolkit to repair Corrupt Mysql, MariaDB & Analyze logs, and Interconvert Databases.Also supports recovery from RAIDs & Virtual Drives. Data Recovery ToolkitSoftware helps to recovers deleted data from Windows, Mac and Linux storage devices.MS SQL Toolkit5-in-1 software toolkit to repair corrupt SQL database, restore database from corrupt backup, reset database password, analyze SQL logs, & interconvert databases.It also repairs corrupt PDF files and recovers all objects. File Repair ToolkitPowerful file repair utility to fix corrupt Word, PowerPoint, and Excel documents created in Microsoft Office.Outlook ToolkitComprehensive software suite to repair PST files, merge PST files, eliminate duplicate emails, compact PST files, and recover lost or forgotten Outlook passwords.Exchange Toolkit5-in-1 software toolkit to recover Exchange database, convert EDB to PST, convert OST to PST, restore Exchange backup, and reset Windows Server password.

Office 365 mail not connecting with outlook client