I ran into an issue with a recent Outlook 2013 upgrade where a new calendar labeled with “this computer only” appeared and all of my new appointments started going to it instead of to my usual default calendar. Originally I thought the appointments were disappearing, but later found them in a new “this computer only” calendar. Ever effort I made to try to get new appointments to go back into the default calendar (proper PST file and email accounts both set as default in account settings) ended in frustration and I couldn’t find any way to delete this new evil shadow calendar that had appeared.
I finally traced my issue back to the way I performed the setup of Outlook 2013. The first email account I created was an IMAP account, and the second account I created was my default email account associated with my default PST file. The root problem was since calendars are stored as part of the PST file, and I first created an IMAP account, there was no calendar to use, so Outlook created this new “this computer only” calendar to use with the IMAP account. Unfortunately it was not clever enough to change the default calendar back to the regular calendar in the PST file once it was available. I also couldn’t find any way to disconnect the “this computer only” calendar from the IMAP account or delete it. The only workaround I could find was to copy appointments from the “this computer only” calendar to my default calendar, which got old really fast.
The solution ended up being very simple. I deleted my IMAP account, and voila the “this computer only” calendar also disappeared. Then I recreated the IMAP account, and since my default PST file was already in place it simply used my existing calendar as the default….and all my appointments are working correctly again.
A tip if you are installing Outlook 2013 and use IMAP: first create a PST file with a calendar in it and as a second step create an IMAP accounts.