A problem occurred while trying to use your mailbox

SYMPTOMS

When users try to log on to Microsoft Office Outlook Web Access in Exchange Server 2010, they receive the following error message:

A problem occurred while you were trying to use your mailbox.

RESOLUTION

1.     At the Exchange Server, enter the following cmdlet:

Set-Mailbox User_Name –ApplyMandatoryProperties

2.     At the Exchange Server, click Start, enter dsa.msc.

3.     On the menu, click View > Advanced Features.

4.     Open the properties of a user who cannot log on to Outlook Web App.

5.     Select Security tab, click Advanced.

6.     Check Include inheritable permissions from this object’s parent.

7.     Click OK twice.

Reference:
User CAnnot Log On to Outlook Web Access Because of Insufficient User Rights

Error message when an Exchange Server 2007 user or an Exchange Server 2010 user tries to log on to OWA

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