Hi
By the sound of it, it looks like it is an Outlook error. Firstly, I would recommend you to run a repair install of MS Office. Please get in touch with your IT guy if you aren't sure on how to do this.
Secondly, on your computer, there will be a folder called premierclassic. by default. This will be found on the C drive, however, if the program has been installed in a non-default location it will be in that location. Within this folder, make sure that you have a copy of a file named "mapi ex disabler.txt".
Hope this helps. Please let us know how you go and we are happy to help.