Hello,
I've seen a few other similar threads about this but have yet to find a solution. I have a Office 365 account on a Outlook 2010 SP1 x32 client. Whenever I first switch from the Mail to the Calendar tab in Outlook I only see my recurring appointments. Once I click on a view (even if it's the same one, like Week - Week) my other appointments appear. If I switch back to Mail and back to Calendar the same thing happends. When logging in the Office 365 OWA all the appointments are available.
So far I have tried:
outlook.exe /cleanviews
Using the Reset View button in Outlook
Created a new user profile
Reinstalling Office 2010
Adding the account on another computer/client (Both Office 2010 x64 and Office 2007 display the same behaivour on the account)
Creating a new calendar and copying the appointments to that (on the same account) (covered in KB197038)
Installed Windows/MS updates
Any suggestions on how to further troubleshoot this issue? As the problem isn't isolated to Outlook 2010 it might also be a Office 365 account/Exchange/calendar corruption issue.