Microsoft Outlook: Cannot open your default e-mail folders

Hello to all!
Can anyone tell me what specific profile I should synchronize with MS Outlook and how is it done?
How can I find the "current profile" needed to solve this error?
Thanks for your help, guys!

Error:
Cannot open your default e-mail folders. You must connect to Microsoft Exchange with the current profile before you can synchronize your folders with your outlook data file (.ost).
