I am experiencing a curious mulishness with my Outlook for Mac and would appreciate any useful feedback on what to do about it. I have a MacBook Pro laptop computer, running OS X Mavericks, v. 10.9.2. I bought the Office for Mac 2011 suite and have Outlook for Mac, v. 14.3.9, installed. Since the OS X update to Mavericks in 2013, using Apple's Mail app with Gmail got to be too much trouble, and I started using Outlook for Mac as my e-mail client earlier this year. It does a pretty good job for me, in general, but there's one thing I've noticed lately that bugs me.

I am not sure whether this contact's birthday is a datum that I transferred to Outlook from Apple's Contacts app with a .vcf card or whether I input the date manually in Outlook, but for some reason, I ended up with the wrong day of the right month and year, and every time I try to change it and to save the change, Outlook for Mac won't accept the new date but instead reverts to the incorrect one. I've tried deleting the birthday entirely, and it will let me do so, but then when I try to put in the correct date later, it does the same thing all over again. I keep telling it that the date I want to store is the 10th, but it persists in showing the 1st. I have experienced the same kind of thing with other contacts' birthdays. What's up with that?