Microsoft Mail Troubleshooting

I'm seeking an experienced IT professional to resolve an issue with Microsoft Mail where I'm unable to send or receive emails.

Key Requirements:
- Diagnose and fix the email sending/receiving issue.
- Check for and address any hidden error messages.
- Ensure the application is functioning correctly without crashing or freezing.

Ideal Skills:
- Expertise in Microsoft Mail and email protocols.
- Strong troubleshooting skills.
- Familiarity with error diagnostics and resolution.

Please provide a detailed plan and timeline for the fix.