It's one of three:
- a problem with your .pst-file
- a problem with the connection
- a problem with the server
The first issue is easy to test: compact it. https://support.microsoft.com/en-us/kb/289987 tells how. Make a copy first, in case it corrupts even further.
As of the 31 December 2015, I am not able to access all my email accounts.. I use three email accounts with Outlook 2007 and only one of these email account is working satisfactorily, the other keep flashing up with error messages see here below one such message. any help is resolving this would be highly appreciated.
error message from outlook.
13:53:26 Synchronizer Version 14.0.6123
13:53:26 Synchronizing Mailbox '***********'
13:53:26 Error with Send/Receive.
13:53:26 There was an error synchronizing your folder hierarchy. Error : 80041004.
13:53:26 Synchronizing server changes in folder 'Calendar'
13:53:26 Synchronizing server changes in folder 'Contacts'
13:53:26 <ABFindAll xmlns="http://www.msn.com/webservices/AddressBook"> <abId>00000000-0000-0000-0000-000000000000</abId><abView>Full</abView><lastChange>2016-01-05T18:07:51.72-08:00</lastChange><deltasOnly>true</deltasOnly></ABFindAll>
Note: Edited by moderator to remove email address to prevent abuse by spammer