Resolve Outlook Startup Crash

Job ID: 40223930

Budget: $10 – $30 USD

My copy of Outlook will not open at all. Each time I launch it, a dialog appears saying it "cannot open the OST because it is configured to use a different mailbox," and then the program closes. I need someone who knows Outlook’s data-file handling inside out to:

• get the application to start normally again
• reconnect the correct mailbox (or build a new profile) without losing any existing mail, calendar or contacts
• show me exactly what was changed so I can avoid the issue in future

You’re welcome to work over a remote session or guide me step-by-step—whichever is quicker. Once Outlook opens, sends and receives mail as expected, and the error no longer appears, the job is done.