Windows 7 Pro 64x. Office 365, Outlook loads slow, calendar takes forever to show shared calendars. Has responsibility for 7 user shared calendars. Running without error since February. Ran both Quick and Online repair. Backed up .ost to .pst, deleted profile and made new profile. I can uninstall and re-install the program, don't want to waste the time if its the equivalent of running the Online Repair. Should I re-install?