[ms office - 2010] "Cannot open your default e-mail folders..."

[comps]

When one of our users opens Outlook 2010 they receive the message: "Cannot open your default email folder. There is not enough memory to perform the operation.", after which Outlook then closes.

 

I can replicate the issue on several computers around the site, but only with this particular used logged on. We are running Exchange 2013 on the back-end. The user can login and use to OWA without any issues.

 

After extensively browsing Google results, I have tried resetting the user's Windows and MAPI profiles, and deleting PST files to no avail. I have tried disabling cached mode and offline use in the Outlook Data Files Settings dialogue, but no change when Outlook starts. I followed a suggestion from a MS KB article (https://support.microsoft.com/kb/2329201/en-gb?wa=wsignin1.0) to increase the size of the memory heap using MFCMAPI but when I load the profile after opening the session I get the following message:

 

Error:

Code: MAPI_E_NOT_ENOUGH_MEMORY == 0x8007000E

Function CallOpenMsgStore( lpMAPISession, (ULONG_PTR)m_hWnd, lpEntryID, ulFlags, (LPMDB*) lppMAPIProp)

File MainDlg.cpp

Line 354

 

Looking at EAC we don't have any public folders setup, but a couple of forum threads have said this may be an issue to do with too many public folders or a really large email attachment (we have a 10MB limit though). Windows Event Viewer on the client PC doesn't have any errors that relate to this outlook problem.

 

Is there anyway I can try and prove one of the above with out systematically deleting everything from the user's mailbox?